I've been in a relationship with this guy for about a month.

We've known each for six months. Everything is perfect between us, or so I think. The other night I overheard on the phone (I was pretending I was sleeping) saying, "Please call me back. I need to talk to you." I know I shouldn't have done this, but when he fell back asleep I checked his phone.

It was some girls name. He has been calling her for the past four months. I don't see any return calls from her to him. I nonchalantly asked a few of his friends about her. Here's what they've had to say:

-They've known each for three years, fooled around for two years.
-He thinks she's a "h*e"
-I've heard their "relationship" was very dysfunctional. He'd call her for days when she would ignore him, and she would do the same to him. They've never been in a relationship though.

Today he started going off on me about me "hanging out with some guy." He's been going off on me these past few days. What's going? Is he in love with this girl? Am I wasting my time???