I caught feelings hard with my first type of hook up relationship, it was my first experience with a guy so I got attached and expected a real relationship not just NSA. Now im not as naive and realize that if you meet a guy on Grindr its most likely that it will end up being NSA, so im okay with it.
I realized it's better for me. When you have good friends (like, real friends, not lover) to talk with, go to the movies, go partying and stuff and in the other side you have guys to have sex with; who needs a boyfriend? you have the best of both worlds and no drama.