The guy I've been seeing is taken, yet he refers to me as his girlfriend. He says they've been having problems and he wants to get out of it, but she's still trying to fix things. When he talks to his friends, he refers to me as his girlfriend, but he's technically already taken by someone else... what do I do? I want things between them to be over officially before he and I go any further, but he seems slow to make that happen. If he's "cheating" with his current significant other, what are the chances he would do this to me?"
I agree, trying to avoid going further before making sure that he is single is a good idea. The best way to solve this problem is to sit down and talk to him face to face. Ask him where things are right now with his “other” girlfriend. If he says that things are over, then everything is dandy. If he says that he is still trying to get out of the other relationship then give him an ultimatum. You don’t “try to get out of” a relationship. When you’re committed to something you do it. Make him commit to you by giving him a date to break things off with the other girl. If he doesn’t commit to you, then it's very likely he is cheating by seeing you. And if that’s the case then you could very well end up in the same situation down the road. On a more positive note, if he does make that commitment to you, then that definitely shows a big enough leap of faith for you to trust him.