Continuing this type of behavior will only push him away. I think that although you say you trust him in reality you are very insecure (don't be if he's still with you then you must be doing something right).
Stop getting so jealous you are defiantly being clingy, and that's not cool. Always remember if things are meant to be then they'll happen if not oh well he wont be your first or your last boyfriend, but if you continue like this (and your barely in 7 months) then your relationship is going to hit rock bottom before you know it.
I have a bf and just know when i get clingy he gets irritated, I've been with him for 3 yrs now and from experience playing cool even when your jealous is better than going crazy every time he talks to a girl.
The world is filled with women and no matter what he is always going to have to interact with them, so you might as well get used to it, and if you truly trust him then back off you obviously have nothing to worry about, Right?