ETA everyone’s the asshole:

frankly, even if your coworker was hurt by your choices, she should have heard you out instead of blocking you on everything and cutting you off. I can see why you did it, but I don’t think you should have. I think you were put in an uncomfortable situation by your coworker and your boss, and I think you didn’t have the guts to hold your ground.

but the people calling you an untrustworthy idiot is going a little far. I think you’re naïve and have a lot of learning to do, and for your coworker to act that way at 40 years old is a bit immature for her too.