Thanks everyone for your kind words--I needed some sanity!
We talked it over yesterday; actually, right after I posted, he called me, and then I saw him later.
When he called, I told him how upset and hurt I was by his "plan," and that I thought we were going to be doing this together and that by using his "plan" I would essentially be a single mom, and if he felt this way, he should have told me sooner.
He honest to God had no idea what I was talking about (I can spot the fake confusion a mile away). So I filled him in the conversation and he assured me that wasn't what he meant at all. Long story short, we still don't know exactly what our plans are, yet (he may or may not graduate this semester, so he may or may not need to go to school next semester), but he said that he definately wants us to get our own place, apart from either set of parents.
Ahappymel, I don't think he meant to say I'd be the primary financial provider (at least, I hope he didn't!). I've made it very clear, for several years now, not just since I've gotten preg, that I want to be a SAHM. A couple weeks ago we had a pretty lengthy discussion about how I did not see the point of having children if I was going to stick them in daycare for 8 hrs a day and let someone else raise them; he agreed completely with me. (And obviously, I understand there are situations where both parents must work; I hope I didn't offend anyone just now!) I knot, too, that while/if he is in school this semester, I'll probably have to continue working, but we both understand that long-term it's not a situation I'm comfortable with.
Thanks everyone for helping me keep my head when I so desprately wanted to bash his into a wall