I had s*x with a girl from work in the female toilets on a works night out. Now she hardly looks me in the eye. She is 23, I am a guy of 24 and we both have partners.

After it happened, we agreed it was just lust and that we’d forget it, but things are now very odd between us. I keep catching her looking at me but she immediately turns away.

We still have a laugh if we are with other people. I can’t work out if she likes me or just feels guilty. I am very confused. We’ve known each other for four years.