Am I crazy?

I've been in the best relationship ever officially for a year now, and it's way better than what I had ever expected. I love this man with all my heart. BUT! He has an ex who is fucking delusional!!! He excepts her phone calls n that's ohkay, bc he takes them infront of me. He also works out with her on the weekends. I know they aren't fucking, but I still have issues with them communicating. He says "I only except her calls bc she's an emotional wreck, she's the type to kill herself". I personally feel like it's worse that they're keeping contact, bc she deep down thinks that he'll always go back to her. She's met other guys after my bf, but still keeps talking to him. He's allowing this. It makes me so mad and insecure. Mind you. We've been together for a year now. They've been broken up for about a year n a half!!! How much more babysitting does a bitch need!? Sometimes, I sit around feeling insane bc I have these thoughts and insecurities. Idunno what to do.