UPDATE: I ended things. I tried explaining and giving the most sincere apology I could while maintaining myself firm and expecting him to apologize for his side of things. The latter didn't happen. He chose to send manipulative texts that tried to guilt me into going back, and this only reinforced the suspicions I'd had of him.
....
But I've realized I can't handle a relationship right now.
I ended a relationship of 6 years back in November of 2016. I was spiraling out of control, abusing alcohol, drugs, and my emotions were turbulent. I had started talking to/seeing another man and was convinced I wanted to leave my fiance for him. I began attending counseling with a psychologist (still going!) and I was diagnosed with bipolar type 2 shortly after my breakup.
I still continued to talk to the other guy, despite knowing my journey towards learning how to be alone and loving myself meant that I COULD NOT date someone until I was mentally healthy again. From the get go he had been insistent on me being his girlfriend, but I knew deep down if I got into something deeper with him it wouldn't be good for either of us, since I was fresh out of another relationship. However, I caved on a particularly low night and agreed to be his girlfriend. He knows what he wants; a serious relationship, eventually marriage, moving in together, etc, etc. But I'm learning from my experience and truly recognize that I can't be with ANYONE right now. We have been dating for a month, so I know for me the connection is still shallow, but for him...he's told me that I'm the only thing that keeps him fighting.
My question, now that you know the context of this dilemma, is: what is the best approach to breaking up? As much as the romantic part of me wants to hang on and see if this works, the realistic part of me knows it's not right and I should let him go. I'm still grieving my 6-year relationship (we were engaged), I'm still learning to love myself and not depend on another's love for happiness (you know you're reliant on others' love when you can't stand being with/by yourself), and I'm just starting my educational career. It's not the time for a relationship with someone who wants a wife, as I'm nowhere near ready for it.
Help, please. In the long run, I know what I need to do, but it always helps to have the viewpoint of others.
I'd like to add on that I had already told this young man that I wasn't ready to be in a serious relationship but that I'd like to just DATE (you know, the old school thing people did to get to know each other before officially going steady). Like I mentioned, I was feeling weak emotionally and caved into him asking me to be his girlfriend, mostly because he became upset with me after I said no.