Do you care if your SO heart eye reacts to someone’s stuff?

So I don’t believe SO would cheat on me ever. That’s not what I think. He heart eye reacted to two girls stories & I can’t see what they are so I don’t want to flip out. I just feel like people could get the wrong message regardless of what the post was. My assumption is that it was of a dog. I’m just a little bothered because I don’t feel comfortable as it can come across to the other party as flirting. am I wrong for being uncomfortable? It won’t turn into a fight because like I said, not a cheater. The most harmless person on earth, he just doesn’t think lol so he wouldn’t see it as weird or bad if it was like a dog on the story. (The reason why I assume it’s of a dog is because that’s what he goes crazy for lol. Huge animal person)