This is a simple question of villain tendencies, your perceived image, and ranging.
You and villain have history. From villain's perspective, would you raise his bet with an A
Xx draw, 88-JJ, or a set? Basically, when you raise, what does villain think you have?
In terms of what we know about villain. Would he shove over the top of your raise here with A
Xx draw, 88-JJ, or a set? Would villain be more inclined to just call down with a set hoping the board pairs and no other spade hits or is he going to jam his sets in on a monotone flop?
If you know villain would shove a set or A
Xx draw in this spot then you can't fold your flush. If this seems out of character for villain and he is only taking the above line with a flush then you can fold your baby flush.
These spots are what separates winning players from players that crush. Its more than just "I haz flush, must call with flush
" Its about ranging and understanding your villain tendencies.
There are plenty of villains I play against that I would snap fold a baby flush in this spot. Conversely, there are plenty of villains I play against in which I couldn't get my money in fast enough on this flop. It just depends.
So I turn the question back to you. What does villain do the above with and how does villain typically play his draws and/or sets in this spot.
Also, how did your villain seem physically? Was he making eye contact, looking up at the TV, shaking any, breathing hard, trying to be still, talking trash, etc etc. I'm not trying to derail this into a soul reading thread, but oftentimes in these spots live tells can give us 10% more info that can help us make the right decision.
What you want to develop a natural feel for is how players act when they are strong and they want a call vs when they want you to fold. Again, not saying this comes down to soul reading, just saying that is info that is out there that can help tip the scale in our favor in regards to making the right decision. Training yourself to automatically look for it will give you an edge most of our villains do not have