Single sad mom

I dont know where to begin with my sadness. I come from a family of mental illness. I was diagnosed with bipolar 1 disorder 9 years ago even though ive known since i was a teenager that i am. I didnt know if i could have children then at 24 years old i got pregnant without trying. I gave birth to my oldest daughter and of course i can never keep a relationship we ended up spliting up when she was 5 months old. I got remarried 3 years later well that didnt last either. I left my 2nd ex husband a year later. Well 6 years later i found i was pregnant but ended up as etopic so i lost the baby & my right falliopian tube. A few months later had a miscarriage then a year after had another miscarriage. Well 7 years later i gave birth to my rainbow baby which was this past Dec 16th. Of course my babys father & i didnt work out before i found out i was pregnant. Well 3 weeks after i gave birth i started seeing a young man who is 20 years younger than me and things arent the best between us but we are trying to work on building a relationship. I told him about my bipolar disorder & hes willing to help me survive my eposides. Well my oldest daughter doesnt like him but never met him. My oldest is 19 & my guy is 24 . My guy has 2 daughters as well they are 4 & 18 months. Theres more issues but ive already wrote alot but im so confussed on what to do with him. Do i try to continue seeing him or let him go? My best friend says i deserve better but no other guys want to get involved with me. I dont want to be single.