What are signs that a guy just wants and not a relationship?

I know the fact that 'all guys want ' but how do you pick out the ones that want just , or want a real relationship. I'm a virgin, and I still plan on waiting for the right one to have a ual relationship with. When I told my past boyfriends, they either cheated on me or broke up with me. So I keep my secret to myself now. And I'm wary of any guys who want to take me out or date me.