[Ruth]

In the first situation, would you really want to go out with a girl who wouldn't have any regard for her friend's feelings? If the girl you're seeing really likes you, and this other girl is supposedly her friend, I would have thought that the second girl would respect the first girl's feelings.

Why are you going out with the first girl anyway, if you feel nothing for her?

Second situation - it seems to come down to which matters more - your mate's friendship or getting it on with this girl. Why don't you talk to your mate about it and see what he says, then take it from there?