It's good that you acknowledge this now, only 3 months into dating him. You can now decide if you want to transition into just being platonic friends or dumping him altogether if you are really sure that he's not 'right' for you.

Maybe you two will get along better as just platonic friends? That's happened to me with a couple of guys, where we both mutually decided, "eeek, we are terrible romantic partners for each other, but we make for great buddies instead."