Broke off with gf over 2 months ago. However, after fucking with plates I realized the sex with the ex was amazing. Problem is, she dislikes me for dumping her and acts completely cold towards me. I'll be meeting her soon at a mutual friends party and I know she will just ignore me. How do I work things out to a stage where I can get back to the physical?

To clarify, I have options and each are good at what they do. She's got her unique skills that I want to play with but not get emotionally involved. Any advice on how to get over her cold wall and get in?