Hi 19820524, I'd say that the main focus should be in trying to get to the route of his insecurities (and issues with trust??) and addressing those. Is there anything in his past that's making him behave like this??
Although maybe he's having insecurities, fears, anxieties with being in a serious relationship as well, doesn't need to mean they have to lead to it falling apart but they do need to be dealt with in that case.
Maybe if you two could talk it out you could find a way forward?? Things might not resolve straight away but............
Don't forget on focusing on what's best for you too though, if you can't come to resolve these issues together then you do deserve better than a relationship like this.
Best wishes, and if you want to talk some more.............

Alison