I know that feeling. I had it at about the same timeframe as well (I'm 5 weeks tomorrow). Keep reminding yourself of why it didn't work and will never work. I personally remind myself of the red flags that I ignored from the start - not to beat myself up over it, but to remind myself that it was never what I wanted. (That may or may not work for you if you aren't yet being compassionate with yourself)
And keep yourself busy, distraction helps. Being with other people helps, close friends or family are best but honestly just being in any environment where you are socializing will help keep your mind off things. I started going to bar trivia on Sunday nights and have a couple of Zoom groups from Meetup during the week. Even though they don't know it, these people are supporting me and helping me through a tough time by just engaging with me. Posting on this board and interacting with people here helps me by reminding me I'm not alone.
I know it's cliché but the feeling
will pass. Take care of YOU right now;
you are what is important in your life.
