Boy meets girl. Girl likes boy. Boy also likes girl but not enough to commit to a steady relationship. Girl agrees with boy that they can be "friends with benefits." Boy and girl sleep together, do everything together like normal couples do. Boy falls in love with another girl. Girl gets desperate and tries to keep boy from leaving her. Boy leaves anyway and has a relationship with the other girl. Girl is now angry at boy because she believes he cheated on her.
Now, does she have any ground to get angry at the guy?
The reason why I posted this is because I know a "couple" who went through this. The girl genuinely liked the guy, possibly even loved him to an extent. The boy really cared for her, just not in the way the girl wanted to. People say it's a rather complicated situation wherein of course, they would pinpoint the guy and say that he is at fault, he's a no-good womanizer, he's a user, etc, etc...
Personally, this is my take on this:
Yes, the guy is a user. He did use the girl for sex, as a stand-by girlfriend until someone better comes along. At the same time, the girl was at fault as well. It's not like the guy twisted her arm into getting into this so-called "relationship." She probably thought that by sleeping with the guy and being all intimate with him, he will learn to love her later on.
Now, here is the biggest mistake that every woman makes time and time again. Let me reiterate it: For men, love and sex are two completely different things! It's not hard to understand! There are women who think the same way but generally women, being the emotional and heartfelt creatures that we are, believe love and sex are part of a formula - without the other, it just won't work.
I'll be the first to admit that there are men out there who believe in love and sex going hand in hand, but it does not make them immune to the call of the flesh if needed. In the situation I have written above, this was surely the case.
I believe that there are people "built" for this kind of "relationship." Some aren't. I know I'm not, but I don't look at people any less if they are comfortable with it. I guess caution is the way to go with this because no matter how clear a person is with their intentions, we are only human and we are susceptible to succumbing to our feelings. After all, what human being does not want to love and be loved in return?