Gf just dropped a bomb on me

So as of yesterday my girlfriend of 1yr says she isn’t happy and doesn’t see how we can move forward. This all started and came to a head when I admittedly confronted her in a passive aggressive way; that I feel like she hasn’t put in as much effort as me in the past week. For context we are somewhat long distance. We live about an hour away from each other but see each other every weekend.

Typically I will call her whenever I get off work everyday, and she in turn will call me before bed. The past week she hasn’t done that because she would watch movies with her roommate. I’m fine with that as I don’t want her to feel obligated to talk to me, but she has only called me once in the past week. I confronted her saying “honestly it’s kind of messed up you’ve only called me once in the past week”. I have been passive aggressive with her maybe once before this and I recognized that was wrong, we communicated, and solved it.

Whenever I called her after work yesterday she says she isn’t coming to see me this weekend like we planned, she hasn’t been happy in a while, hasn’t felt like herself, and doesn’t think things will change. This was an absolute nuke dropped on my head with no warning or indication that this is how she feels. She was literally talking to me about us getting married 2 days prior. I asked what she was unhappy with; me, the relationship, external factors like work, and she couldn’t give me a concrete answer.

We talked this morning and I told her that she has made herself abundantly clear, and if she isn’t willing to be open and work on things then yea we’re done. I know there has to be some underlying factor that made this pop up, she has been super stressed with work because her job sucks, she recently lost a friend group. I feel like this is some self-preserving behavior. I told her I wasn’t going to beg for her to stay for my own dignity, and the way she came across it’s like she wanted me to fight for it. I told her with how much we’ve been through and everything I’ve given her, I at the very least deserve a face to face and an explanation as to why this happened all of a sudden. She said she can’t this weekend but we’ll talk on Sunday to figure that out.

I’m mad because of how hypocritical this is. Part of me wants to say I’m there for her and I will support her with whatever she’s going through and we can work it out. The other part of me is saying screw that do I really want to be in a relationship with someone who is capable of this? I’m taking the high road right now because I won’t degrade myself into begging and pleading for someone who won’t put forth the same effort.

I’m at a loss here since this is so sudden. This is the best relationship I’ve ever been in and I really saw myself marrying this girl. Hell she said she was going to marry me a few months into us dating, and has given no indication that she is unhappy. Am I going about this the right way and how would you all approach this?