^ This. Ethros and Kommander should share a few pointers with each other.
Giving me shit in my own thread is one thing, I deserve it there. Bringing it here... and you people wonder why I outright dismissed a lot of what was said.
Anyway, the OP: First of all,
Ethros, ignore the shit-talkers. They talk shit because, when they've gotten frustrated about dating in the past, people shit-talked them for being frustrated, and they think that makes it fair to do it to others. What you're feeling is normal, and venting here is a good outlet for those feelings.
Based on what you've said, I see two likely possibilities. 1: something at least moderately serious has come up in her life and, having dated off and on for a few months, she doesn't consider you being close enough to her to involve you. or 2: She doesn't want to see you anymore but doesn't have the ovaries to be decent and actually break up with you.
The best thing to do would be to assume the first one is true, but not be too pushy, in case it's #2. Wait a few days, and then call or text and say something that could be interpreted as fitting either of the likely options. Something like: "We just kind of suddenly stopped talking, is everything okay? If something is wrong I'd like to talk to you about it if that is what you would also like." Then, leave it to her to contact you after that. Either, she'll tell you what's wrong, tell you she doesn't want to talk to you about what's wrong, actually break up with you like a decent person, or just ignore you like an ovaryless coward. In short, closure.
If there's another problem, maybe you an help or be supportive. If she dumps you, well, it's actually a good thing. Being in a relationship with someone who doesn't want to be there is almost always much worse than being dumped.
Here's a relevant video to cheer you up:
[yt]http://www.youtube.com/watch?v=LzrKi-QNnzA[/yt]