I'm fed up with him, but I love him

I told him there was a girl who made me feel insecure, and even though he knew it, the day after we broke up he was glued to her, doing homework together, playing games together, and wow...She has better chemistry with her than she did with me.

And not only that, but she also told that girl that I was jealous, and now every time I talk to that girl she feels uncomfortable with me, but I don't hold any grudge against her, I love her very much.