His single female coworker added my boyfriend on FB and chatting to him?

My boyfriend went to a work due. He doesn't know all his colleagues well as he has 200+ workers. He came home slightly drunk. And noticed the following morning that she was a new friend on FB. When he opened his Messenger, I saw they had chatted (but didn't see details). Should I be worried?

His single female coworker added my boyfriend on FB and chatting to him?
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