second guessing the opposite sex

I like to think that when it comes to relationships, i know myself quite well. I know my type, i understand what encourages me and what deters me from entering into a relationship. I don't trust men i have a fixed slightly sexist view of them and what they want from me, or women in general. This perhaps is the reason for my recent mistake in love, I met a guy and we had fun but i took this to mean light, meaningless and nothing too deep, which is great but i also decided this meant i could only have a purely sexual relationship with the guy. He by the way did not have a choice or say in how casual i was keeping it. And a year after it began he has snapped, telling me that sex is not the answer to everything, making it clear to me that this boy has feelings, and maybe just maybe *gasp* some of these feelings involve me. From this i have had the revelation that communication really is the key to a healthy relationship, although... can anyone really call love healthy?