I am at my wit's end about my colleague. We are both Heads of department and must cooperate on projects together. Both are middle-aged, married and have kids - for context . The workplace is mad, but we have been good, supportive colleagues and have helped each other a great deal over the years. We are both stressed at work but confide in each other and help resolve issues when possible. Lately, he’s been acting off in person. He would blank me and go for coffee with a male colleague but never ask me. He has then started avoid me in the office but will call frequently when WFH, and then he’s my BFF… I don’t get it. We work in a male-dominated environment, and I am on good and friendly terms with other men there. Do I ask him or leave it be? Why is he acting this odd?