Originally Posted by Somegeezer
You don't have to be poly yourself. Consider his own freedom though.
The way it sounds to me, is that he is not happy about something though. Try sit him down and talk to him, without distractions. Nobody should be looking for other relationships when there are problems in the ones they already have.
Agreed. I don't think making a relationship more complicated or 'dynamic' will solve problems, quite the opposite, it is likely to expose them more.