I can understand your pain. In 2014 me, my wife and my son I were having some problems and she walked out without as much as even saying "I'm leaving". Then she called my son lied and said I kicked her out of the house. This caused my son to turn against me too so for about 6-7 weeks I didn't hear a word from her or my son and didn't have any idea where they were. All those weeks I sat here at home alone basically night and day except for when I'd go to visit my mom for a few hours a week. She'd done this before and stayed with friends for a few days or a week until I'll let her come back home, but this time I didn't put forth much effort to try to find out where she was and by the time several weeks went by all her enablers had pretty much left her side and she ended up having to rent herself an apartment, buy some furnishings and find transportation for herself since she doesn't drive. Finally after all these weeks I did get a chance to talk to my son and he told me where she was. Since I found out all her enablers had left her side and she was having to make a go of everything on her own I contacted her. We started trying to work things out, but I didn't just say OK come back home. I let her continue to provide for herself for awhile letting her visit the house and maybe spend 1 night a week at home at first, then two nights a week, three nights a week, etc until I finally told her she could move back home if she'd learned her lesson but I didn't expect this to happen again. When it was all said and done I found out what all she'd spent money on and I think I figured out that her little expedition ended up costing her in rent, loans from her 401K, and credit card bills she ran up for furnishings about $10K. For the first few years we were married we had a joint checking account, but that ended when one time she left and pulled out half of everything that was in it when she'd contributed nearly nothing if anything, so from that time on we've had separate accounts. When she came back home I had the money in my checking account that I could have paid the bills off, but instead I showed her how to get herself out of the debt and hardship she'd created for herself out of the money she worked for and made while still paying her share of the expenses here at home. I figured if I paid her debts off she wouldn't learn anything from it and if we did end up divorcing I'd have just been paying the bills she created that I wasn't legally liable for and then she'd still have got her portion of what I had. Since 2014 when she found just how much it was going to cost her to have to provide everything for herself she hasn't decided to move out again. If at a later time your boyfriend wants to make up with you I suggest you use some of the same tactics to let him know you're not a puppet on a string he can just simply reel back in whenever he wants. I know it's hard when you love someone, but I suggest you get back out in public areas meet up with old friends, make new friends and start working on trying to make a relationship for yourself and enjoying life again. If you find a relationship you're happy with and he comes begging tell him you've already moved on and you suggest he do the same.
Actually 28 years ago when I started dating my wife I was still very much in love with a previous girlfriend and I had feelings for her several months into the relationship with the one who is now my wife. My wife knew this and after I started my relationship with the one who is my wife the old girlfriend started acting interested in me again, but I didn't sacrifice what I'd already started with my wife to take a chance on being hurt by the old girlfriend again, she'd had her chance.