So the guy that told the girl you were a pothead is one of your friends? Why would he cawk-block you like that? I'd have a little talk with him about saying that to her, especially if it's false. That may be the reason she doesn't seem interested in talking to you as much anymore.
Maybe she and you stopped talking because at a point, she did like you more than a friend, but she didn't want to be the one to make the move or say anything. You just took too long on doing the same so she got frustrated and gave up on you.
If you miss her, call her and talk to her. Just make it casual at first. "Hi, what you doin?" Blah blah make conversation. Just tell her you miss talking to her and you two should do something this weekend or whatever.
YOU'RE the guy so just talk to her. At least you won't be able to say you didn't try if she still seems uninterested. Give it another shot.
