I'm stressing again what if actually I am not in love with my gf and I'm not missing her right now?

I get like this too, questioning these feelings. But I would try to remember that you can not be missing someone, and still love them. I’m away from my family, and sometimes don’t miss them. I love them unconditionally, but sometimes am happy where I am right now. And I think that can go the same for a relationship. I hope this helps? you got this, hang in there, and know you’re not alone with thinking this