Is my friend trying to make me jealous?

This sounds a TON like what is going on with me and one of my friends right now. As for Jill I would say that there is a chance she is trying to make you Jealous but she might be making you jealous without realizing it. Personally, I would try and ignore what she does and see if how she acts changes. To kinda show bob that you like him I would, if you don't already, kind of find out if he plays any sports or is in band or a choir and show up at some of his games or performances. Then during conversations ask a few questions to know more about him but don't do it in a creepy way. Kind of start off like, "so I rember that you said that you (enter activity here) and I was wondering.......?"