I disagree with most of the above posts. Men look, that is how their brains are wired, they are visual. Most of them do it a little more discretely, but they all do it. You have to get that, if you are going to be married. Also, who he talks to on facebook should be his business, privacy is important in marriage also.
About the women sitting on his bed, he is not married to you, so you really do not have a say. A lot of men feel that until they are married they can have other relationships-I know this is an unpopular view to a woman but it is the truth.
You'll have to stop being so insecure if you want to be married, or you are going to be miserable. So work on that, and good luck. I bet if you can show you have changed and are not always bringing things up like him looking at a waitress he'll ask you again.
Just pick today as the day you will start trusting him and stop looking for evidence to contradict that. If you get the urge to check email, ask questions about where he has been, etc. say STOP to yourself. He will notice.