How to get over someone is a heck of a question...one I have yet to answer definitively for myself. It's hard, with that in mind, for me to offer it to you, but I'll tell you what I've got so far.

Part of it is having to learn to let go, which is easier said than done. You've got the memories of the good times with the person, and the thoughts of what it'd be like...the curiosity, in a manner of speaking. You can have the memories of the good times, and even the curiosity (provided it remains within your moderation), but you must learn that those thoughts can be yours, but the person can't be.

Time is, of course, a major factor...with time, you'll find yourself naturally moving on.

It sounds to me like you, in some regard, resent your bff for being engaged to your crush...that's a rough situation to be in, I know, but the best possible solution to this would be to try to let this go...give things time, and try to move past him. I do second Angel's suggestion to try to give yourself some space, but...with him being attached at the hip to the bff, that's difficult, I understand. I don't see how things could work any other way...if you were to intervene (don't...like Angel, I don't think you would), it would only serve to ruin your relationship with your bff...or both of them, depending. You have to, hard as it may be, let them, as their friend, pursue their version of happiness...if you're right, and they aren't a good match, you only owe them your ear and understanding, and the willingness to listen to their problems. But you can't try to break them up...even if you believe it's for the best. They have to figure that our on their own.

Hugs Doc...I hope things work out. I know situations like these suck...been there myself. Never a fun spot to be in.

Hugs,
Harley