Losing My Best Friend To His New Girlfriend

John is my best friend, we dated in the past for about 8 months on and off, but that was a while ago. I'm now engaged to someone else.

When I started to see my now fiance I was very considerate of John's feelings, as we had both been single for our entire friendship with the exception of the time we dated each other. I made sure to spend time with John as we always did, I also was careful not to throw my new relationship in his face as I was aware that he did still have feelings for me. I put a lot of effort towards this as did my fiance and everythings worked out very well.

Now John has gotten into a relationship, quite quickly, and is not extending any of the considerations I did to him. I hardly see him at all, and when I do he brings his girlfriend and ignores all his friends while he makes out with her in a corner. She's not very social, and although we have all made an attempt to get to know her she doesn't seem interested.

John thinks I am acting "crazy" and shouldn't expect him to take my feelings into consideration. I of course, disagree.