First of all, you can’t be friends, especially so soon after a break up. Accept the fact that you’re not friends — you’re exes, and there is a big difference. If you do want her back, then you have to keep from falling into a friend zone — which as you can see, is very difficult to get out of. I think that if you want to get her back, you have to do two things simultaneously: 1) Focus on dealing with your jealousy since that’s what broke you two up, and 2) Ask her out on a date and “woo” her back. It’s very simple — and very difficult at the same time, but that’s the best way to deal with this situation.