What would you do had you been in my place? Please Help?

Been dating a guy for a year now. He broke up with his ex of 3 years but when we started dating, he was very honest about how he still talks to her and is in contact. I was okay with that, but it really started to piss me off now as his ex ( who is a mutual friend ) has started to put me down over social media, bad mouths about me with other people. I told my "potential boyfriend" about how i am not comfortable with him still being in contact with her, to which he replied " i don't want to let her go, it will at least continue for another 6 months ( the end of our final year at university ). He says he has some reasons to do that. And apologised for hurting me.
Other than that, we have very good understanding and bonding.
His ex is literally being paranoid.
I decided to give him time and let things go as they are going. What would have you done had you been in my place?
We are both 23 by the way.
What would you do had you been in my place? Please Help?
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