Is my coworker into me or am I reading him wrong?

I been working with this guy (we'll call him Steve, not his real name) from about 3 months now and I have gotten this vibe that he might have a crush on me. To give a little context my workplace has about 200 people working at the same time but because our schedules are the same we often seat next or close to each other, we don't have assigned seating, I've noticed some hot and cold behavior from him, some days he is completely cold and barely acknowledges me and some other days I catch him looking my way several times during the day, once I even lowered my chair because I was starting to blush because of his constant staring, another day he ended up seating closer to the exit than to me but before he left he went up to me just to say hi even though I was busy, he constantly asks me when I'm going to lunch so he can wait for me but I just see this as a friendly coworker not wanting to go have lunch alone. We also have this playful banter going on and inside jokes and most of time that we are not busy with work we talk about the stuff we like and we have many things in common, he even once asked me if a had a picture of the hobby that I had told him about weeks before. I've noticed that when I'm not close to him he holds his stare but when I'm near he can't hold it; but, a couple weeks ago this supervisor came up to me to tell me that another girl (we'll call her Jessica, not her real name) who always likes to be the center of attention told her that Steve has been asking her to go to his place, I don't know if to believe it or not because this girl always seems to have someone hitting on her or she constantly runs into people she's slept with and apparently she can get it when she goes out, it's always drama with her and honestly when we are at work he doesn't really talk that much to her, but at some point they were friendly, anyway, this supervisor told me that story because Jessica apparently doesn't know what to do because she thinks Steve is hitting on me, which I didn't even think at the time because I'm always oblivious about this stuff, to be honest I feel like she is jealous that he doesn't pay attention to her anymore and is making it up. I don't really know what to think about the whole situation and I need a third person perspective because I'm biased. I mean does he have a crush on me or is he being just friendly, he does stand close to me most of the time and when we don't end up seating together he always tells me to move near him which I rarely do, however, if he did have a crush on me then why hasn't he asked me for my phone number or followed any of my social media. To make things interesting, plot twist, I'm married, and I think he knows, once another coworker asked me how did I meet my partner and I played dumb and pretended I didn't hear him, Steve did hear and he walked away and a few minutes later he left the room; my marriage has been more like a roommate/friendship thing in the last 6 months. I'm really confused about everything, please let me know what you think.