Jealousy is UGLY! This has been something I put a lot of effort in not being. To me it is controlling and it just leads to hate and resentment. I just think that if he is gonna cheat he will do it weather or not you catch him. Also, controlling behavor like this will drive him to seek someone who trusts him. Be that person who can trust him! :-) Otherwise, be prepared to lose him...

If this behavior is a "reaction" to a less than honest ex just remember he is not your ex! He is waay better! ;-) Good Luck my dear!