NGL that would freak me out. I am very protective of my number. Like if someone hmu on other aps that are more public, then fine.
But if you are interested and he doesn't seem like a creeper then I would see where it goes, but go slowly. Also, don't be afraid to tell him if he crossed a line.
But if you are interested and he doesn't seem like a creeper then I would see where it goes, but go slowly. Also, don't be afraid to tell him if he crossed a line.