Is he potentially flirting?

A guy I work with, who is in a relationship, I have caught checking me out, he stands close to me sometimes, there is long eye contact and he asked me what I had for dinner the other night and I told him I had something in his area where he lives and said "oh if I had known that we could have gone together." Is he being friendly or is there something going on at his end?

Is he potentially flirting?
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