My (27f) boyfriend (32m) and I have been dating about a year. At the beginning we played around with the idea of being ethically nonmonogamous, but decided against it for a few reasons.

Fast forward a bit: he has an ex he's friends with that he's flirty with. I've said I'm not comfy and he dialed it back. That was a couple months ago. I started spending more time with her to try and overcome some of my own insecurities and jealousy, and I do really like her as a person.

Just recently she shared a post that said "if you have a crush on me, send me 100$" and he actually sent her 100$ in response. When I asked her about it, she thought it was funny and didn't accept the money. My boyfriend also said it was as a joke. I'm curious to know what nonmonogamous peeps interpret about this. Because all the monogamous people I know draw a very hard line in the sand, so I feel like it's hard to get a real answer on what they think is going on.

So, crossing my boundary aside, if both of them don't think it's flirty, then is it indeed not flirty?