He stay online after we said bye by at night around 1am, some hours later he still online, why?

We've become really, really close in the last month, we became something, not officially dating yet, but something close, he knows how I feel and that I don't wanna do anything sexual, so we've watched movies at nights sometimes, but lately I couldn't sleep and I've noticed he stays online, if I messaged him earlier he won't reply to my last message but still online, all is just very weird...

He stay online after we said bye by at night around 1am, some hours later he still online, why?
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