How do you LET SOMEONE GO?

I have loose ends with my ex that came back into the picture 6 months into my new relationship. I moved on quickly but not emotionally so it caught back up to me .Ive been in a big mess the last couple of days between my ex and my gf . my gf feels i need to pursue my ex because of everything i told her about my relationship with my ex she even told me to see her and talk to her. I seen my ex and it felt good to see her talk to her hold her and all of that but i just feel my connection with my current gf is way more for me than it was with my ex even though it was only one day. I seen alot has changed from my ex in 6 months from the break but i dont feel shes woman enough for me to meet my need like my current gf does.

Even though my ex says she is prepared for what happens if i go back or stay she ready to deal with it . I dont know how to do it because she was my first everything and i was hers so i dont really want to lose her completly. We ended things so wrong im still confused if we should go back because she is willing to go all in if i was to go back. My mind and heart favors to stay with my gf but there is still enough in me that cannot tell my ex that i cant go back to her.

Here is what i really need advise on because i know alot of people feel your ex is your ex for a reason but push that to the side and respond to this please.

Me and my ex during our relationship had lows but for some reason i always made myself the victim because of how not smooth things where going but i knew she had issues but loved me. so towards the end i wanted out because i didnt feel she loved me anymore and told myself that i was the victim and everything and by venting to most of my friends they really didnt like her either and always told me i shouldnt put up with it. when i ended up ending things she didnt really put up a fight after it happend so i told myself yea she wanted this to happen and it was true that she didnt love me and all of that basically hating her. Now to come to it i was all wrong and in the 6 months looked back on the relationship and found alot that i could have done better and after talking to her found out what made her act the way she did with me and it hurt because now i look at it i wasnt a good bf at all when it matterd. Yea i was calm and giving and all of that but supportive and caring i think i could have been better way better. Anyways to cut it short it ended without closure, with me hating her and not seeing my wrongs in the relationship etc. do i just deal with i found someone better for me or do i go back to fix things ?

You say your ex has changed a lot over the past 6 months, then you say YOU were the one who went about things the wrong way. Your current gf suggested you try things with your ex. Lastly this is your ex. Taking this all into consideration I have to ask, have you changed? Are YOU prepared to be a good boyfriend to your ex, have you bettered yourself for this new relationship you're in. From what I can tell, you're not sure what you want and you shouldn't be with anyone right now. You have your current gf in limbo right now along with the ex waiting on your decision. You need some time to yourself, clear your head, decide what makes you happy. 6 months isn't that long, especially between two people who were "firsts" to each other.......I know there's a lot of emotion stirred up between you guys which is why I'd recommend some a lone time for yourself. First I think you need to break up with your current gf, don't drag her thru all this, she doesn't deserve it. How old are you all? Clear your head so that you can look at this as rationally as possible.