Our expert says:
In many ways there's nothing special about the internet world, except that it makes some forms o bad manners easier - if he was hanging over the back fence and gissipping with a neighbour while ignoring you, that would be seen as really bad manners, selfish and inconsiderate. So is this.
If he flirted with other girls at a party, he's feel ashamed of himself, and this is the same behaviour. He's probably using this as an excuse not to concentrate on his studies. If he isn't a total idiot in his studies, he has not need to keep chatting with his class-mates about what work needs to be done, or to discuss whatever he is supposed to be studying. And his interest in the other girls ( there's no reason to believe these are actually varsity girls ) has nothing to do with their academic qualifications.
Bad manners. Tell him calmly but firmly that if he can't start treating you with respect ( and giving feeble and obviously false excuses is insulting, too ) then the relationship will end.
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