My boyfriend lied about going to bed?

Anonymous
He told me before midnight that he was going to bed and told me goodnight. This morning I wake up and see that he was on Facebook a couple of hours after he went to "sleep". This is the first time he's told me that he was going to bed and didn't (that I know of). I have major trust issues, not particularly from him. Should I be worried?
Updates
+1 y
Well I'm talking to him now and he said he went to bed pretty early and woke up at 7. He didn't mention being up that later time. But he said that some of his friends went out but he didn't, when he told me goodnight he took a picture of his bed.
My boyfriend lied about going to bed?
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