Is this considered cheating?

My friend has a girlfriend (LDR) but he and I would occasionally flirt... but we’ve shut it down and have strictly kept it platonic but now we have a snapchat streak going and there’s a 💛 and I know this drama seems juvenile but since we’ve had a history of flirting, I should stop right? Like I REALLY want to play this off as platonic but... I know deep down there’s something going on. But also maybe there isn’t?? Maybe guys and girls really can just be friends and I should keep acting normal with the snaps... but like am I enabling him to cheat somehow with all this?