Break up with first boyfriend. LDR. Need Advice

Hello guys!
I'm just new here and i'm hoping to receive all the advices you have for me, i'd appreciate them.

The thing is.. A week ago i broke up with my boyfriend, we were in a long distance relationship and i am saying what i feel and about my gut feelings but we were having problems since June 2015. He had problems in his neighborhood about insecurity so he couldn't come and visit me also during that time and old friend came back into his life and it made me feel upset and worried because he would talk to her but i wasn't able to have any guy friends so i removed every guy from all my apps since we started dating (we lasted 2years) because i cared about my ex.. i told him to remove her and he did once but then he wouldn't talk to me in the same way so i'd lose my emotions and go crazy so he ended up adding her back and i felt they kept talking but he told me he didn't and he would say she was feeling lonely(caring more about her than me) and that she had a bf and were living together but i think it was a lie.

Few months later in october i noticed he would reply with less words and not in the same way we used to so i ended up feeling lonely with no friends (I am a totally lonely person) then i met a new guy from school (i study engineering so it's been always hard for me to have girlfriends so i have none and it was an issue with my ex when i told him it was about school but he wouldn't understand my feelings) and added him and my ex would tell me he wouldn't talk to me while he was there so i tried hard and removed him from my fb.I thought he would become closer to me since i told him i was feeling lonely and i've never had friends so he was the only one for me but he kept being short.

During those months i kept talking to my new friendA about school and stuff on whatsapp bc he was really friendly and nothing pervert and we would play videogames while my bf was there so he got upset and being short but then my friendA met a new girl in the last days of December and they became a couple and i was very happy for them. Then my friendA would keep telingl me to add him back to fb and that he would talk to my exbf about it and that we were doing nothing wrong.. so i did added him back in last days of December and made him block my exbf so he couldn't see bc i knew my exbf wouldn't understand, i know it all sounds wrong what i did and i regret everything but in that time i had this feeling my exbf would be talking to her old friend and he kept adding people to skype while i wasn't able to add anybody or he would leave me, also i tried be friends with his friends but in the end he ended up making them remove me from my skype so i became even lonelier and i feel sorrow and i've been depressed and losing weight since it all started.

My ex bf found he only blocked him and that i had him on then i tried to explain it to him that we never flirted because we never did and that i only wanted a friend while he was ignroing me telling me he over slept but i feel it wasn't true.. I ended up removing my friend in January from everything and my ex would ask me to prove him i loved him and that he could trust me again so i ended up deleting my tumblr, twitter for him and since the beginning of our relationship he would get upset if i had all those apps because it would attracct guys so i wasn't able to use any of those, i had them but didn't use them ad before.. i am not so pretty but not so ugly, i just feel that way so idk why he could be that jealous.

Well he asked me to prove it to him so i made a video craving his name on my skin and he would say it was nothing even i never did something like that to my skin and the mark from the scar won't go away in a long time and he wouldn't trust me the same but he would keep giving me chances so i used to sent him gifts to his place and more videos because he wouldn't want to videocall telling me i was disgusting. He removed me when he found about me having my friendA on fb and he kept adding me back when i showed him proves but then he would get upset and remove me again.. it all lasted a long time, since January i kept trying because he was the only guy i've loved and my first boyfriend and friend during 2 years, he were everything to me so i've been suffering with depression since a long time and it's bad, i feel so depressed and sick.

So the bad feelings that i've noticed is that he and his old friend were sharing stuff during our relationship since she came back because i can see it on their profiles now and during our relationship he would recommend me things that his friend liked (movies, books,anime..everything i found on internet she likes he would share it to me and it always made me feel sad so i ended up adding my friendA back and i would tell my exbf about it but he would get upset) I had to find out all of that by myself and my exbf made me feel he was just a copy of her, and sometimes i would tease him that he had a crush on her but he would say no but how come they share every single thing.

After we broke up i see now they listen to music at the same time, when she updates her profiles i can see my exbf do the same thing and they just use the apps at the same time making me feel they're talking a lot and it makes me feel they're dating now. I know i shouldn't stalk them and try to improve myself and i've been trying but i am also so tired about everything in my life. The saddest part is that they're doing this only a week after we broke up.

I need advice why he would be this sick and bad to give me pain like he did during all these months giving me chances telling me he was trying to get his feelings back.. in the end he dumped me with very bad words he told me i was a whore (i'm virgin and i study engineering so it's hard for me to have girlfriends and friends at all) he told me i was disgusting and that i should leave him alone, he told me very cruel stuff. I just can't understand why a person can be this cruel. I tried so much for him, i feel he only was healing while i was in his contacts since January. It all ended but this pain kills me everyday,i can feel my heart literally ache. I just need some advice or kind words to clear my mind.