Is it messed up to give dirty money to a good cause?

This wasn’t even a recent thing that happened to me this was last year in the fall/winter but I think about it a lot. I was so broke last fall I met a couple on a sugar site thrice my age and planned to meet. Our first meeting was our last meeting, and we just met in public (of course) at a restaurant and got to know each other. We got dinner which they paid for (I got tiramisu for dessert it was so good), went to Winco to stock up on drinks, then went to their house, watched a movie on their sick mini theatre setup, and talked music. They had cute dogs and they were such a nice couple. Nothing weird happened, I called my uber home and before I left, the husband gave me $100 to compensate the ride. I just stuffed it in my bag and said thank you/goodbye.

But literally like a week after, I ghosted the couple. It was a shitty move to just disappear like that, but I felt so much guilt in my soul and they wanted to pay me more to get physical for the next meet. I just couldn’t bring myself to do it so I completely cut them out, tried to stop thinking about it. If I’m being honest, I don’t know why but I felt really scared about the whole thing.

Cut to a couple weeks later, I called a Lyft to go to my brother’s place, we were just gonna hang out for a bit and I was bringing some snacks. But my Lyft driver there and I had a really nice conversation, he was telling me about his daughter who was in school for business or something, I assumed she was living with him.

Though he told me right after that that well, he lost his job last year and while Lyft helps while he looks for a better job he’s been living in his car for months. It made me very sad, I kind of imagined what it would be like if my own dad ended up like that, I know my siblings and I would take care of him.

As we’re talking I start to think of the $100 still decaying in my bag, and so before I got out at my brother’s house I just slapped it on the armrest. He just closed his eyes saying thank you and I wished him well,, and went to meet with my brother. I felt very happy that in some small way I could help, but at the same time I felt a little weird about specifically giving him the money I got from the couple I met that one time. It wasn’t my money, and I didn’t work hard to earn it. Idek how to frame the question but was it okay to give him that money? I don’t know what I’m asking I hope someone can understand what I’m trying to say, thanks for your time.