My marriage? Should I let go?

For some time now my husband has had issues with infidelity. We have a 3 month old daughter and well for the sake of keeping us together for her I’m trying. But he keeps doing wrong. Should I just let go of my marriage and let him be? Will he change will he regret what he’s done to our little family? I was born Christmas in 1992 and he was born in June 10 1992 we are both monkeys