First thing, you did what was right. If you hadn't raised the issue would you have wanted to stay with a man who is continuously cheating on you but you're afraid to tell him so because you don't want the relationship to break up? Don't you see it would affect you negatively?
For him to dump you because you asked in a kind manner shows the level of respect he has for you and how much he loves you. Who knows, don't you think maybe he would have dumped you later?
Yes, you love him but think how the relationship would be staying in it with someone who is unfaithful.
You should stop any communication with him for one to two weeks. If he doesn't respond within that period, then you'll know he wasn't really in love with you. During this period work on yourself and reflect on the relationship. If he doesn't contact you make up your mind to either contact him or not. I would advise you not to and to move on with your life.