Sleeping with some guy/girl don't mean that sex have to happen necessarily. But means that some level of intimacy must be present... Cuddling, Kissing, Touching, Smiling... And i guess none of that is present
The problem with lisa is that this is an recurrent situation independently who the guy is
I prefer to believe that the guy wasn't crying because rejection but for something else, because it will be very weird to understand when he was still there all day