Male coworker touches my hand

I want to know how my male colleague feels about me. It's worth saying that I'm in love with him. A male colleague, much more older than me, was showing me photos on his phone and suddenly took my hand and held it. I squeezed his hand back, it lasted about 20 seconds, then he took his hand away. We kept talking about work, and he didn't look at me when he was holding my hand.

Another day, when I was sitting next to him and typing a text from his dictation, he touched my arm several times (below the elbow), then ran his fingers over my arm (below the elbow, too), as if stroking it for about 5 seconds. We were also talking about work at that moment, meaning we weren't actually flirting.

Why was he doing those things with a serious face? Although it all happened around other coworkers… Was that a flirting? (Sometimes he compliments me that I’m beautiful – so, I guess he flirts with me sometimes)