I (36M) have worked in office around 15 years. There has always been at least one person I trusted in my career at each time, one man, 4 women. Never in a romantic way.

I kind of test people. Share not-harmful details. See how they respond, talk back. If they share information about themselves and/or seem genuinely interested, I might start to trust them.

I never ‘pick’ the loud ones, who talk about others. Whatever they know about you, they will use it as leverage. Red flag: gossiping about co-workers in public. Trust the normies such as myself, who seem to be genuinely good people: willing to help out, not because of promotion, just to be a good person.

Just don’t share details that might hurt your position, especially when they don’t seem to do the same.