She loves me but she doesnt want to go through it Huh?

ok first off im 15 and she is 14 which seems young i know but idk it seems real. I feel like i love her and care about her more than anything in this world i would do anything for her. We have a sorta long distance realationship. But before this we usually talked every day we have been together 5 months and weve broken up 3 times. First time she broke up with me cause she thought i didnt love her and that i loved her bf. Second time she broke up with me cause she was tired of fighting with me and her sister wanted her to break up with me. Ok this last time was something i couldnt figure out. So were back together for two weeks first couple days she seems like she cares but every night she falls asleep on me. I ask her why shes been sleeping and she says shes just tired. So last night she starts talking about she old bf's and she knows how i feel about her talking about guys i told her not to do it. Well she goes on about all the older guys she dated a 19 year old then a 20 year old and somewhere along the line i call her a hor. Cuase im an idiot well she hangs up and i call her back and makeup so then a couple minutes after that idk how but i say "y dont you go marry the 20 year old doctor then" and she says "maybe i will". So i break up with her cause i get mad. Then i call her about 100 times through the whole night and she finally awnsers and she cut herself and says she loves me but doesnt want to deal with it anymore. So i BEG her to take me back like i did the last 3 times we broke up. I just feel like im the only one that cares cause im the only one who tries to get back together ever. So she says she loves me and hangs up the phone cause her dad came in. In the morning she calls me i try and beg for her to take me back but i think i was making her start to cry cause she was on the bus and she said she had to go but idk. Then she gets her phone taken away so she calls me from her dads phone and tells me she got her phone taken away and tells me about her day like she usually does then says she loves me and i started to ask her about us before she went and she said she couldnt talk about it cause her sister.

I just want to know if i should try and get her back. Good things are she makes me happy, i would do anything for her, i care about her and love her to death.

Bad things are that sometimes i feel like she doesnt care. I think its cause i expect to much from her but idk. She never tries to make up with me. I always have to beg her. I dont think i could get over her.

What do you think i should do?