Okay, so you broke up and now you told him you can be “just friends” with him…..
I never think it’s a good idea for anyone to be friends with an ex unless they’ve really, truly moved on. You clearly haven’t, and I think it’s a bad idea for you to be friends with him. You’re way too invested in his romantic life to be friends.
Decide what YOU want and you’ll feel a lot better about things — but my advice is not to be friends with him. 🙂