What to do about a roommate who was a fwb, has a g/f and wants to get a house together?

Livin together for 15 months now. Up until 2 months ago were fwb for 8 months. Had 2 miscarrages... No longer fwb since has a g/f. Currently livin w/ parent on family farm. I am saving for my own house. He wants to move w/ me. I am not interested in marriage, and supposedly neither is he. But the g/f is. His ex (dated her for 2 months while we were fwb, now seperated for 2 months. new g/f been w/ for 7 weeks. i found out he had a new g/f via myspace. he never told me n we were sharing a room. now he has own room) wants to still marry him & have his kids. She's telling people he's still having w/ her. Now g/f broke up w/ him after hearing this (for 2 days), but now going back out since found out she was spreading rumor to get him single so he would go back out w/ ex.... lots of drama!! ... current g/f will not have w/ him cause she doesnt want to be "another girl"... do i have the right to be upset? why does he date females that are looking for marriage?; when he supposedly isnt... he works 14 hour shifts and in past month and � only slept at my place 3X... should i kick him out? .. i really do love him..we are both 21... do u think he just needs time to grow up and is afriad of commitment? Ur thoughts?