A lifeguard at my gym keeps staring into my eyes without a smile and without breaking the eye contact. What are his intentions?

One day he was walking past me at the gym and as he looked me in the eyes he couldn't stop staring and ended up almost turning around. Somehow it made quite a huge impact on my emotional state. Or rather my libido... Then i saw him in the mirror, checking me out as he was leaving. Since then every single time he saw me, he was just staring. No smile, no words. I usually look down, but when i look back at him, he's eyes never leave mine. When I was at the swimming pool, his gaze always wondered to me. The signals were rather obvious to me until i found him on Facebook and realised he's been going out with one of the trainers at the gym since, like, forever. I've seen her around and she's a very nice and friendly creature. And size 4 or max 6 with perfect skin, while I'm 8/10 with cellulite and stretch marks (mind you that's important since I'm usually seen there in my swimming suit!) as the pregnancy wasn't too merciful to me. I'm not a family breaker so since i found out i avoid looking at him and I'm preteding total ignorance of his burning presence on my side vision, but i still catch him staring. One time he let me through the gate. I was listening to music very loudly so i barely acknowledged his "all right" and muttered a "hi" or something equally out of place. When i finally sqeezed through the gate, i managed to look up. I wanted to smile, settle some kind of truce between us (maybe just for me as my pride is a little hurt... people think only men have egos!), but what i saw in his eyes stopped me in my tracks. His eyes where kind of empty, or more like... guarded? They didn't look the least friendly, just cautious, kind of tired. I've seen him few times since then and he carries on staring. His girfriend seems to be keeping a strict eye on him too. Every time i come to the window above the swimming pool, she comes to, like she's checking who i look at. I'd like to know if anyone has any idea what's on this guy's mind? Am i imagining it?
A lifeguard at my gym keeps staring into my eyes without a smile and without breaking the eye contact. What are his intentions?
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