Can I get people's opinions plz

Can I have some people opinions, is it crazy to break up with someone for something they did a year ago?

So boyfriend and I have four children together, right after I had the fourth he was sending dick pics to some woman for an extended period of time and her to him. If it was just me I would have left right there and then but since we have kids i thought maybe it's not big enough of a thing to break the family up over. I kept telling myself that in time my feelings for him would return but it's been a year and I still feel nothing for him. But I feel kinda crazy saying I think we should break up over something that happened a year ago, if that makes sense.