Advice needed please

Hi, I am looking for some advice. I ment my partner (30m) 3 years ago and things were going great with is. We had issues with my children's dads and social services die to their dads being controlling and abusive towards myself which has made things difficult. Anyway about a year ago my partner went on a night out with uis best mate. Whilst on this night out my partner ment a girl to try and set her up with his mate. Anyway since then he has gone on numerous nights out with her after i have explained thay i am not comfortable and do not trust her due to witnessing her flirting with my partner on numerous occasions, this has been dismissed. Come new years eve i had asked him a week before ig he had wanted to go out to see the new year in as if so i wpuld need to areange childcare for my children he continually told me no he wanted to stay home with me and the kids. New years eve comes and 2pm he tells me he is gping to go out that night and see the new year in woth his brother and best mate. He then proceeds to not speak to me for most of the evening except a phone call for less than 2 mins at midnight. He doesn't return home until gone 6pm new years day. I then found out this girl was out with them and he saw the new year in with her as well. This upset me and I asked him to stay at his sisters for a few nights while I thought things through. He tells me he won't be coming back then and we are over. A few weeks pass and we start talking again and he is accusing me off being controlling as I asked that he is only around this girl when i am present (as not only was she always flirting with him he was lying about small things to do woth her e.g a necklace he came home with was hers he told me he was given it from the pub) we came up with a compramise of 30/70 70% of the time he could avoid her and would but 30% he wouldn't be able to due to her dating his best mate (who she had already cheated on). This was working great he got his own place after staying with his sister for a few months. During the tike he was with his sister we barley saw eachother as he didn't want any of them knowing we was talking and trying to work on things again, he would lie to them if he was at mine or ignore my phone calls when he was at theirs. It reached a point due to the children's dads that he wasn't allowed to come to my property for a period. Once he got his own place he started to see me less and less again. I have now told him this is not enough for me I need to see him more than every 3 weeks especially as he is now allowed around my children again in the community as they are closing up their investigations. Am I over reacting to 1. Him not making any effort to see me and 2. To the way he was about being around f this other girl and how it made me feel? Just to add i did have a conversation with him and this other girl regarding my distrust of her and her response was "most girls dont trust me"