Need relationship advice

Harley
Me and my boyfriend of 9 months almost 10 I guess you could call it a rough patch we went from talking ever day all the time to him takeoff hours to text back he used to come see me all the time but now he disses me for his friends 
He puts working out with his friends before coming and seeing me he constantly puts hit friend comments in to our relationship but like I tell him I don't date his friends. I have a feeling he might be cheating but he don't give me much reason to believe that he mostly puts his friends and video games before me I've tried talking to him but he just says I'm nagging at him. What do I do can anyone give me some advice 

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