This happened to me.
At that point, I didn't do anything but feed and do water changes. I pretty much ignored my one guy at the time.
One day, I had a horrible day, like sobbing my eyes out. The dog jumped on my face and scratched me instead of comforting me like loving mammals should, so I went to the fish tank and stared at my boy for probably an hour, then realized I felt okay again.
After that my interest in fish has only grown <3
You probably just need some time off. :) Once a betta lover always a betta lover.