Relationship advice 🤔

I know most of you ladies wouldn’t stay with your man but let’s just be real who can relate to my situation if any... My fiancé and I were young and childish when we got together so many problems, he cheated on me a lot (he only talked to these girls) Never actually slept with anyone.. I also cheated several times as well.. I’m wondering has anyone started off bad in your relationship and it end up getting better, mine as got better, but still a lot of work to go through, one thing that I think hurts the most is when we was suppose to get married 4 months before he told some girl “he wanted to have sex with her” but long story nothing happened... but I have a big problem with remember the past and always letting it creep back in.. I really love him but I mean advice on the whole situation? Does it get better? Have you stayed? Can men change? Did you forgive your love and make admins?