Fiancé lying about coworkers

Fiancé works in a shop, mostly men but also obviously women work there.

I’m not insecure at all, I encourage him to have opposite sex relationships.

He tells me all the time he barely speaks to any women, but I found out this is not the case. He speaks to a specific woman, who he frequently talks badly about. They have been liking each other’s fb post, which he lied to me about even having added her.

When I asked him why he talks badly about this woman but talks to her daily at work he told me “they have their days”

Thoughts?