I don't quite understand the question. Dating the guy you had no reason to know or suspect that he only wanted to fuck you. Or maybe you did but did not tell us.
But at the point that you are at his place and find another womans cosmetics, alarm bells go off. He gives a really lame excuse. He lost the gf, but kept the cosmetics, how dumb does he think you are? Pretty dumb as it turns out. At this point you want some fun, i.e. sex so you get into bed and fuck. Nothing wrong at this point. You know that he has been lying but maybe it has been worth it. Sometimes there is a big jerk at the end of a good penis.
Now you find out how big of a jerk that he is. He must have got a call or text about the other woman coming over and had to get you out of there. Stiffed you for the raxi fare. at least you know where you stand.
It isn't all that unusual for a guy to try to screw several women at the same time. This clown isn't very good at it. But you made the decision to go for fun, so it should not be a surprise that he was doing the same. To answer your question "why me?" The answer is that you agreed to it.
You need to be more selective about who you date. To check for sincerity and singleness, try changing dates a few times. Move to the next day, or a few days. If it is easy, he may not be trying to schedule you into bed between his friday and sunday screws.
Good luck.
