Is this flirting or cheating?

Question

Ok so my boyfriend is the one with the cocain name and I was going through his muisc were this song came up and this girl makes muisc with him were they do comment sometimes. And this song is about sex and getting in the mood and all that stuff and I read the comments and saw this, is this flirting or am I overthinking, I'm asking because I do admit when I'm on my period my emotions are through the roof and I do tend to overreact on TONS of things. 
Update just found this to

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I honestly don't know. Didn't know people could communicate with only emjoies.

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I think it's inappropriate but not cheating. I'd have a calm conversation about it if it bugs you but I wouldn't freak out

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Disrespectful that's what talking to girls online isn't cheating perse' but it's just as bad. He's doing it for attention when he doesn't need to be looking outside the relationship for attention from the opposite sex. If you did that to him he'd probably freak out on you

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Idk, I can't read emoji but it seems a lil hot and steamy

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CHEATER CHEATER yep that's cheating!!! Fuck him

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This is something I would personally not admit in a relationship.. and yes I would consider both flirting and cheating.

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That's flirting at the very least. The second picture looks a lot more like cheating.

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I don't think that is cheating, but I definitely think you both need to talk about it.

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Confront him about it

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Flirting IS cheating hun