Any advice on how to get someone out of your head?

I was dating someone about 6 or 7 months ago, we broke up but his best friend is dating my best friend. I know we don’t see eye to eye and he feels like we shouldn’t hang out because he doesn’t want it to be “awkward” but this is sooo hard and i find it very hard to not want to still hangout with him. I see him often because him and my friend are close but i dont get invited to parties he will be at anymore. I don’t think I am completely over the situation although I need suggestions on how to get over it and move on! help??? :)