this is a long story....?

[Captain]

I've been with my fiance for 6 yrs. Things have been rough for a long time, mainly b/c of his drinking. We lived with my parents for 3 of the 6 yrs b/c I got pregnant and lost my job and he could keep one. In that time, he worked but spent all the money on drugs and alcohol. I kept giving him "another chance" We finally got out on our own and the partying continued after the baby came, and then another baby came. I kept believing him when he said he was done drinking and going out (stupid, I know) He has 2 older children who he didn't pay support for so he ended up in jail for about a month. After that, he of course, said he wa done partying and he stopped for about month. He started working nights (paying support regularly by the way) and he would go to a bar after work with co workers, and sometimes not make it home til 10 pm, he got off at 6 am. I eventually grew numb to everything. I was indifferent. Then we were getting ready to move to a house and I got violently ill and couldn't pack anything. He went off the handle b/c I hadn't packed anything, wouldnt help with the kids while I was sick and said really mean things like he normally did, but I just snapped. I was tired of being treated so bad. We moved and I didnt have much to do with him. I was in school b/c I lost yet another job. I asked my mom if I could move in with her untill I got on my feet and she said to stick it out with him until I was done with school (I about 3 more yrs of misery) So i was stuck. I started talking to a guy I went to high school with, a lot. I talked to him every night for hours. I only saw hima couple of times for a few a minutes at a time, but he made me happy to talk to. My fiance quit drinking for real, and I didnt even care, b/c I didnt believe him. The kids were so much happier though. Well, he found out I was talking this guy and needless to say was pretty upset. I stopped talking the guy b/c he really reminded of my fiance a few yrs earlier. I found out he was selling perscription drugs and thats something that really isnt my style (believe it or not) and I wanted to be a happy family with my kids and their dad. Thats all I ever wanted. Me and my fiance are still together but he wont stop questioning me about this other guy. Its been 4 months. My theory is, if we're going to stay together we need to put the past behind us, and move forward, and if he cant let go ( which i understand) then we need to spilt up. I cant take the questioning, and him not believing me when I answer. He says he doesnt want split up, should I just leave anyway? I think he's put me through enough.