So, if he gave up the apartment, how could he leave at any moment? I know it's hard, but can you look at that as a positive, a small step forward? He had an apartment set up, was ready to start moving in and decided to stay with you.
Try not to read into the miniscule things, like the cat email. It could have come from anyone- an old friend, sister, brother, co-worker. If he sent it to you, he must have thought you'd at least get a smile out of it.
We've all had those days when we say "I don't think I can do this". I must have said that to myself a thousand times. But you CAN do this, you ARE doing this! Try to be patient and hope that tomorrow will be better.
