Well it sounds like you are committed to an uncommitted man as WC pointed out. You have a couple choices, asking him if you can each be mutually uncommitted and you start dating others yourself, or you can decide to leave the situation and be on your own til you meet a man that shares your vision of committment. Of course there is the other option of asking him to be faithful, but it doesn't seem like that one is going so well. I'm sorry for your hurt. I am sorry you love this man too much to run for the hills. Its really a case of will you be happier with him while he cheats or without him while he cheats. Of course he may change but all signs point to him wanting to be single while still holding on to you. Its in your court now to decide if thats good enough.