i did post about this before but just need to know.

my man of 7 years.... and 2 kids. was cheating on me. he did cheat alot i more recently learned but there was one time i knew about where we had broken up for a 9months.... and got back together. this was when our kids now 6 and 5 where only babies..... but. 3 years ago. i learned he cheated on me again only this time it resulted in the girl ending up pregnant and he left me to be with her. he moved in with her and they started a family..... when there daughter was 9 months. she got pregnant again with there second.... but..... so did i. me and him slept together one night while he was visiting our kids.... so while im also pregnant with our 3rd he still stayed with her. went to her scans and babys birth. i done all mine with family. he didnt really want to know. he also was letting our kids down alot while he was with her. but there was alot of problems with trust in there relationship because of me also being pregnant. she was breaking up with him alot. and giving him a hard time over trust when he was at work. she drove him insane. eventually it jusy didnt work. but when there second turned 3 months she fell pregnant again. and is curfentlh prsgnant and due in august. he then came back to me when they broke up. around march. told me it was all the biggest mistake he ever made and he hates her. will never touch her again. wants nothing to do with her anymore or this unborn baby she was meant to abort. but then in april she told me they slept together 3 times just beforw easter and she was unaware until that day that we where even together. he denied this all. and ive stayed with him. i know for weeks ghey didnt spesk and she hated him and said alot of reslly horrible things to him. but within the last 2 weeks there back in contact for the kids. and getting on civil. i want to believe it will just stay that way if he keeps proving to me i can trust him. and so far things are going good. will i likely continue to be able to trust him. will i ever feel secure and fully happy in this situatuin with him. if we can somehow finds means to build trust???