I feel like we're falling apart

I don't understand why my husband doesn't want to do anything with me like sex wise or anything other then that . I'm not sure if I just have a higher sex drive or what but I just wish he wouldn't get mad when I bring up sex , or even asking for simple hug or kiss . He never texts me back so I stopped trying to text him or call him . If he does answer back he's like "what do you want" in a mean voice . He's to busy on his phone with this game he started playing and I see he talks to people in it but I don't understand why he can't talk to me .? I always have a gut feeling he's cheating or talking to someone else but we're with each other a lot of the time but he usually stays his distant from me or he goes to work which is rarely because hes PRN . I don't understand why I feel so unloved