Every few years, our small team goes on a excursion and usually everyone attends. This year I declined the invitation simply because I didn't feel like going, I found some new hobbies for myself and I want to spent more time practicing them.
However since this is somewhat uncommon behavior, my boss took it on himself to investigate the reasoning behind this and also get me on board with everyone else. He assumed that I'm having financial issues and discussed it with one of my close friends in the office, while beforehand he also spoke to a few other colleagues, without my knowledge, asking them if they would be okay to donate a certain amount of money to pay for my travel.
How should proceed? I'm upset and while I do understand why he did that, I do not agree with the approach he has taken. There's nothing specifically wrong about not having the resources to afford the trip, but I don't want my colleagues to feel pity for me when there is not need for that.
It's worth pointing out that we recently had some incidents in our family that required medical care and that's probably the main reason why he believes money is the problem.