Should I be worried

Me and my boyfriend have been dating for about 3 months now and he's relatively shy and doesn't talk to a lot of people but recently he hasn't been texting me as much and when I go on his phone he takes it away from me and won't let me have it and when he does let me have it he is right over my shoulder...I've had cheating problems with past relationships and I'm scared he might be hiding something there was once time when I was gonna go on his phone just to look at pictures he took of us and he grabbed it out of my hand and we basically fought over the phone he even through it under the couch so I couldn't get it

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