What is the straight-up story on Alex Gaskarth and Lisa?

OK, so some people say they recently broke up, and most say they're in an "open relationship." I know they got together in high school, but did they break up after that and get back together? Where do jasey rae and the coffeshop soundtrack girl come in? If you could just give me a short timeline, that would be great! I'm not creepily obsessed or trying to get with him, I just want the clear facts.