I 22F cannot get over the fact that my boyfriend 23M lied to me before the start of relationship. What should I do no?

So I 22F met my boyfriend in college first year 24M who was in his last year back then
We dated for 3-4 months and broke up because he moved back to his hometown after his college.
He asked me for fwb back then and I accepted because I was really into him and he was my first relationship.
In second year we met 2-4 times just for sex. And in my 3rd year we came back together as he was coming over my place a lot and we were basically living together for about 3-5 days a week.
But after coming in the relationship I realised he was in contact with a girl 21F his school’s junior for about a year in which they sextexted and made out once in which she gave him a handjob and he went down on her. Sex didn’t happen because she refused.
He claimed that he didn’t answer her calls or such from the day we started dating but even in fwb when he was coming over I asked him if he is seeing someone else I don’t want to do anything with him where he refused to be connection with any other women.
I talked to this girl and I got to know the full story. He just ghosted her from the day he came over my place and she tried to call him.
I was heart broken because he was all that I ever had and even though he didn’t technically cheated on me he did lie to me. He said he didn’t remove her earlier because nothing was going on with them and he was also in contact with another girl whom he fucked once and I had to beg him to remove her as well.
We broke up again after more than half a year because of long distance again even though I really tried not to break up he was adamant on leaving me back then. but after a few months we came back together where he was the one who asked me out.
so in this relationship, I am like the happiest I’ve ever been, and he is literally the best he has ever been. He confesses his love a lot. He tries his very best, and I can clearly see the difference in the past and the current him, and I’m very happy about it even now he thinks about and plans of future together, which he usually did not do back then,
Actually I became friends with the woman he made out with when we broke up, and now he’s very uncomfortable about it also because he thinks and knows she is a bad influence on me which might be true. so I decided to cut off my ties with her.
But I cannot help, but be tormented of that fact that he was at a point intimate with her and still used to talk to her when he was over my place, and this just fucks up my mind a little to think about it.
I’ve already confronted him multiple times about it
What should I do now? Should I just forget about it?