Is he really flirting with me or am I going crazy?

He is super smiling when he comes home and talks to my husband, out of nowhere I started thinking about him 24 hours a day, and I never talked to him, we only exchanged glances once, I already had a dream and in that dream it seemed very real, I entered in his room and when he woke up I and he got scared, and the next day very early he showed up at home, I sent him a message pretending I didn't know who he was and he said he already had my number saved, and asked if I was married?

Is he really flirting with me or am I going crazy?
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