He probably wants to date you, her, and and possibly another girl all at the same time, so don't fully commit to him either. Be open hearted and go with the flow and be prepared to pick yourself up in the end if doesn't work out. Guys can seperate feelings and find time to balance time between his girls. Guys like to date a lot of girls at the same time to see which one will be most the compatible with him. I think that's crazy and asking for drama though, girls can get crazy and catty, so I don't understand how some guys can be in multiple relationships in today's modern times. Just as long as he's not married, you'll get fingers wagging at you if you're dating a married man. I prefer a one-woman kinda guy though, that will devote his time and attention to me and only me. But if you must compete with another chick, go ahead, but play it smart and cool.