I'm going to play devils advocate. I DON'T ever want to remarry EVER. I have issues surround step families and blending and a host of other issues. But I do think I will eventually be ready for a committed relationship. I don't think the one is any more or less of a commitment. I have seen a huge number of marriages dissolve into hatred and animosity and horribly situations. I have seen committed loving relationships without marriage going on for years.
Mizpah, I can completely understand why this hurts though. My only advice, I'm not in your situation, but maybe step back and see if it is that he isn't commitment or just a lack of wanting the paper? Unfortunately, only you can answer if it will be enough and I'm so sorry you are going through this.
Now I will also say knowing how I feel, I had an ex try and get back together with me awhile ago, but knowing he has always, will always want a marriage, I turned him down (although he hasn't given up ) because I don't think its fair to him,