I would weigh the negative impact of having this person in your life at all at this time against what you receive. It sounds like your own flame, your fire is threatened by it and your #1 life task is not to be with your twin flame, but to protect your own from danger or going out.

If I were you, I would separate completely from him until he feels able to commit. He is protecting or manipulating his own flame by not committing and you need to protect your own, adjust your own to account for that. The only way you can be whole-flamed it sounds like is to cease interacting with him in any way until he can be whole-flamed too.