Boyfriend’s ex

My boyfriend and I have been together for three months and I love him, I really do. But I think he still loves his ex. And is that okay? I mean they were together for 2 years and she really hurt him but it’s hard for me as his current girlfriend knowing that he still thinks about her. I’m scared to have this conversation with him but maybe I should. I just don’t know what to do because sometimes I wonder if he’ll ever love me as much as he loved her or as much as he still loves her. I’m so confused. He says that she’s irrelevant and he doesn’t care about her anymore but sometimes I think he’s in denial and doesn’t want to admit it. I don’t know what to do lol.