Break up with him?

So I'm in a relationship with this guy and we've been in a relationship for about 6
Months. And this guy is flirting with me and I'm kinda flirting back with blushing emojis, we're flirting over snapchat but it's just like "😍" and "your so cute" stuff like that. I just respond with a picture (of my face). Well when I think about breaking up with my SO I still get sad and feel like crying but I'm not sure if I like this new guy yet. (I feel really horrible about even sending blushing emojis back because it could be considered cheating) 

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