<human>: My girlfriend and I have been togethers for a year. It started out great, but around three months in, she started getting depressed and sad and anxious during a time when I was studying for a very very important test. 

Taking care of her and trying to pull her out of her state and encouraging therapy, counseling, etc.. But she was having none of it. It got better but my score had noticeably suffered and I was resentful towards the situation. I can't blame her for being depressed, but I also was upset that I suffered as collateral.

Fast forward to now, symptoms are coming back on. Skipping work, not studying, avoiding class. I can't do it again. I have tests coming up, and I'll start my last year of grad school. 

Do I put an ultimatum about getting counseling? I don't know how else to approach this. I want to help her, but I can't do it as a sacrifice to myself

Can you summarize the given text in a few sentences?
<bot>: My gf of one year is relapsing into depression, the first time it happened both of us suffered, what do I do?