Depends on content of the 'talk'. If its just friendly, like he'd talk to a guy, then back off. I'd get angry too if my husband ragged me about talking to old classmates on FB. If he's talking to them in flirtatious way, them sounds like he's needing some freedom and your relationship is coming to an end.
I say you start talking to other guys online, and once he gets jealous and gets your point he will stop and u will stop. Or, once finds out your point he will talk to you about it, you guys will makeup, and you will both stop talking to those people.
If he's getting angry when you tell him how you feel knowing he's talking with other girls online, he's obviously NOT going to stop what he's doing. A guy who won't talk with/listen to you about things that bother you, AND won't stop doing those things... well, he's just not worth wasting your time on. A guy who truly cares about you would discuss this issue -- OR -- he wouldn't do things that make you feel hurt, sad, angry, jealous, etc... to begin with! You didn't say how much time you've invested in this relationship -- however long it's been, you should chalk it up to a learning experience, dump the guy & move on. You'll find someone who genuinely loves you, cares about you & how you feel... :)
Is he "talking" to other girls as a friend, or is he "talking" to girls as in flirting or asking out? There is a huge difference. If he is being harmless and just talking to them as a friend, I don't know why you have a problem with it. If he is trying to get with these girls, and you know it, but he won't stop, move on....he's a player and doesn't care about your feelings. Don't try to make him jealous by doing the same thing. That's childish. Just find somebody you don't have to worry about this with.
First of all, determine what kind of conversations he is having. Who are these people? Are they just random hot facebook chicks, or are they old school friends?
Secondly, anyone will hide a conversation if someone sneaks up behind them to read it. Just ask him casually "who's that you're talking to?" and see how he responds.
The best way to communicate in a relationship is to be flat out honest. TELL him that his behavior makes you uncomfortable. TELL him you don't understand WHY he's so insistent on hiding stuff from you. TELL him he has no reason to be defensive.
Lastly, take him at his word until you have proof to the contrary. If he says they're high school friends, then believe it. Part of a relationship is trust. A lack of trust is the first thing that causes people to act untrustworthy. Just be sure to hold him to his word. Don't attack, but don't put up with bulls*** either.
okay, I understand how ya feel, gurlie. but guys are really weird like that. Okay, so, first of all, then don't confront him about it. Just listen to me on this one, just join into the conversation. If he's just talking about sports or the science homework, then no biggie. But, if he is super flirty, or just super touchy with the other girls, DUMP HIS BUTT TO THE CURB. YOU ARE WAY TOO GOOD FOR HIM.