SHOULD I TALK TO MY EX?

Me and my ex broke up a few weeks ago and he's been calling me, trying to reach out.. I answered for the first time and I didnt say anything but he said he wants to move on himself too but he has a lot of questions. A part of me wants to give him answers, wants to give him closure but every time this happens, I always end up falling back again and it's harder for me to forget him since he knows how to use his words and hit right to my core. I don't want risk feeling that way, I don't want to risk getting back because I'm seeing someone. But a part of me does want to give him closure, does want him to be happy without me.. am I selfish for not wanting to give him closure because of how I feel? Or am i doing the right thing?