Need advice !

So my best friend is dating the guy that I've had a crush on for quite some time (She knew about my crush on him , she even told him forever ago) but he's always had a crush on her , Well now they're together and I'm expected to hang out with them and she's always saying things like "omg when you come and visit you can come and hang out with me and Chandler " And I ALWAYS make up some excuse of why I can't visit or when I do visit and he's around I find a reason to leave the two of them alone because it just feels really awkward for me , I try to tell her that I just want to hang out with her and she doesn't get it , I try saying it in a way that doesn't reveal that I'm jealous of them being together and how bitter I am that he wanted her and not me. Also she calls me sometimes (not as much as she use to) but when she does call I ALWAYS have to hear about him ! How he surprises her with random gifts , pops up to her job to take her to lunch and just spoils her & truthfully I'm so bitter that I don't even know how to fake that I'm happy for her and I hate that about me , I don't want to be jealous of her because I love her we've been friends for like 3 years but my jealousy is getting outta control to the point to where I don't want to talk to her at all. What should I do?