Will he change his mind?

Do I get best answer? :D

It doesn't sound like there's any chance. He broke up with you twice really. If a guy wants to marry you, then decides that he doesn't want to anymore, that's a MASSIVE warning sign. It means he's not as happy as he used to be in the relationship, and is on the downwards slope. He then tops this off by saying he doesn't want to be with you anymore.

It would be lovely if people just said what they meant and meant what they said, wouldn't it? Unfortunately, we don't always have a clear idea of what we want.
It sounds like he's confused. It's hard to let go of a loved one, no matter how much your feelings have changed because people are most comfortable with what they are familiar with. I know I've felt that confusion before. I knew our the relationship was over but couldn't really let go because I was afraid I was making a mistake. How can one know whether or not they're letting go of the best thing ever? You can't.
You can't ever really know how he truly feels. He could be saying what you want to hear because he doesn't want to hurt you - but his life is moving on while you guys are apart. He could be confused by his feelings - he wants to be faithful yet those around him are tempting him to be single. All you can do is get by one day at a time with your own best interests in mind.
Moving on doesn't mean forget about him, it just means to not let opportunities slip by because your waiting for this to work out. I vote to keep the friendship alive but learn to live without him. Not because it won't work out, because there is always a chance that it will, but just in case. I guess I'm trying to tell you to hope for the best but prepare for the worst.
Good luck.