In my experience, men can like a woman, spend time with a woman, have sex with a woman, have "chemistry" with a woman, use a woman for their own wants and desires, and still walk away without a word. The more amenable the woman, the more accommodating the woman, the less demanding the woman (and probably the farther away the woman) the easier the man can do this. I will add that I believe the same situation can apply to women doing this to men and to men doing it to other men, and women doing it to other women--don't want to be a sexist). The simple answer to your question "Why do men do this" [why does anyone do this?"] is: Because they can and because they get away with it. I'm not trying to be funny; I am pointing out a fact. I make no excuses for the people who do these things; there could be many additional details and circumstances to each situation, but in your case, the fact that he is still communicating with you however casually tells me he hasn't mysteriously disappeared and/or is not hospitalized in a coma, nor is he suffering from amnesia. I've seen all kinds of reasons and excuses offered (worrying about career is a popular one) but the actual situation remains the same: the person who wanted a relationship is left to wonder what happened? You have three options. Stop communicating with him without explanation. Tell him the way you see things and let him answer (or not) or keep communicating casually without mentioning "hey I feel like you led me on..." In the future, regard your heart as something precious and to be wooed and won by someone worthy of it, and don't rush into sex--or marriage, for that matter. There are also plenty of people who regard spouses as disposable as sex partners.