I found out my boyfriend cheated on me

So I found out my boyfriend cheated on me last Sunday and since then he has slept with three different women. I don’t know what to do with myself this hurts so bad. He doesn’t care how this makes me feel. He hasn’t even called to check on me. I was the best girlfriend I don’t understand why he would betray me like this. The worst part is knowing I’m at home sobbing and he’s out living his best life sleeping around. God help me because I am in such a dark space right now. FYI I did break up with him when I found out