I'm going back to a job I left a while ago. The past few weeks I've been doing temp work, doing admin in an office which I really enjoyed, and recently I've realised I was the happiest I've been in a long time here. But ultimately I decided to return to my original line of work.

Today I bumped into a girl from the job I'm going back to and she bombarded me with negativity. It reminded me of how negative and draining she was which I'd somehow forgotten. I now feel so down and I'm close to tears, and can't believe I'm back in this place.

I've already made my decision to return to this job which probably was not the best idea in retrospect. How can I protect myself against this level of negativity? I can't believe how much seeing her brought me down.