Found out husband cheated one me (via phone sex..called an ex) while I was 2 months pregnant and we were still bf/gf.. not married yet, but talking about it.

We had gotten to know each other for a week before we got pregnant. (I know please no harsh judgment!)

we worked together for 3 months or so before actually getting to know each other.

Fast forward to 2 years being married and having one child.

I find out what he did (the stuff I mentioned above) when we were bf/gf..I freaked the fuck out even though he’s a great father and an okay husband (not really empathetic..sucks sometimes)

This hurt me so much..not sure if I’m over reacting but I feel like leaving him, but my son loves him unconditionally and is super attached to him.

He in return said that at the time we were just bf/gf and that he was stupid and has changed. He said he hasn’t cheated since, but I don’t know what to believe

What do I do?