I think I made a bull uncomfortable ...now what!?!

I've been soft flirting with a male bull for a little over a year now. I'd say we have good banter, light flirting and an overall good time when chatting. Recently, I was on vacation and text him a picture of me poolside (my legs were in the shot); yes the text was meant to be very flirty and evoke a positive reaction but his response was just "nice pool". I didn't respond until the next day because I felt silly afterwards and then a few days later when we met up, he seemed very uncomfortable in my presence and rushed to get away. Since then, we've gone back to being friendly but I'm wondering what happened there? He's told

me before that any man would be lucky to be with me, he enjoys my company etc. so I didn't think I was misinterpreting what he was saying so I sent the photo to be fun.

He is either already taken....or just not interested.