crush

So there's this guy we've been talking on and off for the last few years we dated back when I was 15 but was an online only thing I'm now 21 and alots changed and I guess you could say I have a little crush on him but I don't find him attractive at all we text a fair bit and he's super nice and sweet and he can always make me smile we've met up a few times for coffee and lunch and movies but I always wonder if it could go further, he always hints at wanting to have sex and asks for pics but I never send them cause I'm just not comfortable but not be physically attracted to him could that ruin on?

Looking for advice