I'm a troubled person

Im a sneaky bitch I know, don't bother telling me I'm a bad friend I know and I already feel low about this as it is so yeah hate comments can relax. I always end up liking my friends partners, I find myself thinking how attractive they are and get somewhat jealous and I want to over come this problem, I've done it atleast 3 times but I've never attempted to make a move or whatever just advise would be appreciated