Could this be innocent or am I too naive?

Recently this guy at work started messaging me, trying to strike up a friendship. He messages me everyday, even outside work and calls me to chat (we stay on the phone for about 40 mins each time).
Could this be innocent? So far he’s been very neutral, just friendly, but not overtly nice, no flirting going on.
It worries me because he’s married and with a baby, I don’t want that kind of headache.
Could this be innocent or am I too naive?
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