Jealousy Game. Just how to end friendship with mate's gf?

My mate's daddy has told him to look at me personally and therefore he does not believe me. We and my mate's girlfriend (7 years 2 children) are most useful buddies. Now my mate will not speak with me personally, will not ask me to stuff and ignores me personally whenever I see. She and I also stay buddies, but, personally i think i will end it, just just exactly how?