Does my friend's brother like me or am I misreading him?

Hola hola!! So my friend’s brother is someone who I’m not particularly close to or anything but we do know each other and we say hi to each other the few times that we bump into each other, which isn’t very often (we live in separate towns). Anywayyy just recently, I started developing feelings for him after spending a few days at their house for one of their sibling’s weddings. I guess I just noticed certain things about him which drew me to him. The things is I have no idea if he likes me as well. I did notice him staring at me a few times but he would always look away whenever I caught him staring. His sister and I used to be flat mates some years back when we were in college and I remember how he would tell her to say hi to me whenever she and I were chatting online during school holidays. I found that a bit strange cuz he and I were not friends and I had only met him like a couple of times. Anyway what are the subtle ways that I can use to know if he likes me or not without actually having to ask him or his sister???