Why do I get the feeling she is sleeping with her New Male roommate?Intimate?

She doesn't sound like she's into you that much anymore. I think you should let her go. Maybe she didn't sleep with the guy, but being alone it doesn't take much for bad things to happen. If she cared so much about you she wouldn't of allowed another guy to be with her. Just do what your heart tells you, but don't let the love blind you because maybe when you finally open your eyes it might be too late and you'll end up hurt.