My boyfriend checks my facebook messenger? What should I think about this :/ ?

Anonymous
My boyfriend and I have been together for 7 months and we're both in college. Whenever I'm over at his place I would leave my phone on his bed to go to the other room or something and when I come back I see that he was using my phone. Ofcourse he can use my phone anytime and he uses it infront of me but when I check on the recently opened apps, I see that he has opened my facebook messenger, (I always close all my apps) and that's how I know he'sopened it. What should I think about this? We've had some trust issues before but he said that he trusts me completely now. But why would he feel the need to check my fb messages?
My boyfriend checks my facebook messenger? What should I think about this :/ ?
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