Welcome to the boards, although I am a brand-newbie here myself.

The first thing I want to mention is that this high-stress time in your lives is a legitimate reason to be hitting "bumps" in the road. I think it might be unwise to judge a potentially depressive situation based on this experience alone. It is well, well worth your time to be patient, generous and understanding during this time and wait it out, since it is something that has a definite "end point" (graduation.)

That said, for years now I have endured in my marriage hanging in there just until (fill in the blank) occurs, the next big thing that will pass and make our lives all better. So if this is a continuing pattern of behavior over time it is a problem. If it is just a high-stress time in your lives, that is completely normal.

Best wishes.