Flirty? Attracted? Sexual tension? Thoughts?

He stares in my eyes for a decent amount of time and smiles, he stands close to me at times, I can sense him checking me out, he writes "have a good day" notes at work with a smiley face, he put a small heart next to my name on a piece of paper, I told him I was going to dinner by myself out where he lives and he joined me on his own free will, told me I smelled good, offered to throw my garbage away, got to know each other and after that he walked me to my car, looked at it and then he gave me a full body contact hug, tightly when he left. He also mentioned going out again for dinner. He texted me randomly about work but he never really did that before and then texted me the next day about something that had nothing to do with work which he hasn't done before either. He is in a relationship, so is he attracted to me and about to cross a line by cheating on his significant other?

Flirty? Attracted? Sexual tension? Thoughts?
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