Search Results: was i too pushy

This guy that I had a casual hookup thing with recently used me to cheat on the girlfriend I didn't know about. We hooked up a few times in September and then things got "too busy" for him - which I believed because we're in school. Over the summer he admitted to liking me, and when I tried to start something he said he couldn't manage dating. I apologized for getting pushy and pressuring him and he said we would hang out and "fix" the situation of us not having sex soon. Last week he snapped a picture of him on a date. The next day we were messaging and he said he was only trying something out with a friend. I said I would still casually jump him but if there is another girl, we can just be friends. We suggestively texted for a bit and then he made a plan to come over. We had sex, and after he told me he had made an agreement with that girl to be together. He used me to cheat - he felt awful about it, but said he wouldn't tell her. I also told him I wouldn't tell her.

Now, it's been a week and he hasn't told her. I want to know if I should tell her or get a friend of mine to message her and say "My friend is in pieces, you should know that this is the guy you're dating" basically, but more elegant. Please help.