That was me a 6 months ago asking if long distance relationships work. My situation was slightly different, there was only my bf and I involved and he was moving halfway around the world. In the end he didn't go anywhere and that was the best Christmas present I ever received!!!
Your situation is a bit tricky. There is someone else involved and there are some things that I agree with. He asked someone else to marry him, he got down on one knee and asked her to spend the rest of her life with him. To me that would be extremely painful to know. But... if it's not working out, and you say you have trust issues with him, it
might not work for you guys either. I agree with juliaw04 that trust is extremely important in a long distance relationship.
Now, these are my thoughts only. If they help you think things through, that's great! Just don't take them as a final verdict and this is what you must do. When my bf was thinking of moving all I heard from my best friend was "dump him already, he's leaving anyway, it'll never work out between the two of you, Don't be STUPID!!" and I know how that negativity hurts.If I had listened to my best friend, I could of ruined things with my bf that would probably be hard to mend. I listened to my heart, and my gut
and it all worked out.
Good luck!!!!!