You know what I really hate? When someone gets in a relationship and suddenly forgets about all their friends because they're spending all their time with their boyfriend/girlfriend.
I can't count how many people I've drifted away from because of this. It's BAD PRIORITISING. You should equally balance spending time with your partners and friends. It's not right, why should I sack off all my friends just because Jess who I've been going out with for 2 weeks wants to spend all her time with me?
I'm NOT, for the record, saying you should put your friends above your relationship, because I know that's wrong. But on the flip side, I wouldn't forget about my friends. They should have equal importance.
Admittedly, I've not had many relationships and they've not been long-term. Maybe this is why though, I refuse to drift away from my friends just because of a girl who I probably won't be with forever. Assuming I broke up with said girl, would my friends there after I ditched them? Probably not, because I'd have prioritised badly.
I know loads of people who manage seeing their boyfriend/girlfriend and their freinds quite well, those are the ones doing it RIGHT. Everyone should take notes from then.
If you spend all your time with your boyfriend/girlfriend and never see your friends as a result, you shouldn't be in a relationship at all. End of discussion.