I am a jealous person too. But my boyfriend actually cheated on me one time. It was very hard to get over it and I am still not completely over it. My boyfriend no longer gets drunk at parties without me when there will be other girls there. I didn't make him do it though he made that choice on his own to show me that he doesn't want any other girl. He has mentioned something about being swingers in the future but he just made a small comment about it. But as for the advice, I don't have much and the reason for that is because it has to come from you. You have to start trusting him more and not get jealous so easily unless he gives you good reason too. It is completely mental and if you can get over it then you will but if you can't then you will have to decide if you can continue this relationship or not. Don't make him feel bad for making a suggestion, looking at porn, or thinking about other women in bed. That is in your own head, unless he is or has acted upon it before. But believe me if you don't get over this or end it he might just get tired of it and end the whole relationship. Sorry if you think I am being harsh I am simply telling you what I tell myself so it is nothing personal.
So let's get to the point, let's roll another joint.