I found out he was married.. would you be mad?

I’ve been on and off talking with this guy more then 3 years now. We met on tinder and started out as a friendship then dating , when we first started talking he told me he had a daughter who was 3 and he was not longer with her mom. I was 18 at the time and he was 25. I had no problem with that because we agreed we didn’t want anything serious. Flash forward a year later and we’ve been dating for a while until one day he decided to end things because he wasn’t ready for a serious relationship. I was hurt but i respected his decision in the end, come to find out later he actually ended things because the mother of his child wanted to get back together. It ended up not working between them again and he ran back to me. I found this out recently or i would not have gotten back together with him.

Turns out she was pregnant again. But it was not his baby ( or so he says ) Once again, i did not question or have a problem with it because i had a child in time where we were not together. ( he’s not my daughters father. ) Something important to note is even when we were not together we were always good friends. I also have never met anyone in his family yet he is close with everyone in my family.

Flash forward to today. We are in my room, it’s 3am, i just put my daughter down to sleep again and he’s scrolling through some old messages between him and his friend trying to find a picture of one of his old project cars. I seen a message out of the corner of my eye of him asking his friend if he was coming to his wedding. My heart broke. I didn’t wanna jump to conclusions so i asked him about it and he immediately starts saying how he told me and that i knew about it and got extremely defensive. He then explained how it wasn’t important and it was before he met me. It turned into a big argument and i began to question everything he’s ever told me. He went back to his house and i’ve been up questioning it since..

I went thru his old facebook and instagram and there’s no mention of the marriage or wedding. I don’t know what to do. He texted me apologizing and i forgave him. I’m not sure if i did the right thing.