Relationship advice... is he cheating?

My boyfriend and I got into a fight (we had lived together). He told me that I should go stay with my parents for a few days and think about who I am as a person. (Long story short i am going to move back in with my parents because it'll hopefully improve my mental health). While I've been at my parents he's been distant and just seems like he doenst care even though he says he does. The second night I was at my parents, he was on snapchat on the phone with someone the entire night and even fell asleep on the phone together. I had asked him about it and he said it was a guy friend that he made off of an app. Honestly I feel like there's someone else and he's not being honest about it. Don't know what to do.
Stay together
Break up
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Relationship advice... is he cheating?
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