Help me paranoid or not?

Right my boyfriend seems to be being secretive or I feel like he is,every time he leaves the room he makes an excuse to take his phone like "I need to ring my mum" ect. Even though he clearly didn't as he never mentioned it and we've had previous history of him deleting messages n that just things like that,he also seems to be distant and have massive mood swings with me one minute he loves me more than anything next he's talking and treating me like wank and every time I tell him he snaps or moans about something I've apparently done is he going off me or being secretive or am I paranoid?