am I wrong?

So, to make a long story short I found out after my son was born that his father (who I was on again off again for 2 years) was engaged and has 2 kids with this woman. I knew about 1 of them and he told me he had broken up with her. Yea in hindsight there were a lot of red flags I should've seen. Anyways... I confronted him and he didn't deny anything and we had a very honest good conversation. I was pleased with how maturely he handled it and accepted his fault. He explained to me that he loved her but wasn't in love with her that baby number 2 was an accident and that her dad threatened him to stay with her so he proposed but had no intention of ever marrying. I believe him when he says this. I obviously told him I don't trust him anymore  because how could I? So here's the thing, my friend obviously care about me and were pissed when they heard about what he did... and rightfully so! But now everyone is freaking out on me because I've forgiven him and because I'm still in communication with him. We are civil towards eachother and that's how I want it. Yea he wronged me, but we have our son to think about. I feel like I'm doing the right thing for us by forgiving and not dwelling on it and moving forward. Doesn't mean I've forgotten, I just don't hold a grudge. Everyone around me keeps telling me I'm being stupid. As an unbiased opinion how do you view that situation?