Guys, How to know if a guy is interested and what to do if you want to talk to him?

sofivv22
There is one guy at the gym, that I had been discover staring at me. one time we made eye contact, and then sometimes our eyes meet or trying to look the other, but he avoid me now and then looking at his phone or turning his back. But Now he I think I'm attracted to him.
The other day I was doing my workout and he came with his friends to use a machine in front of me and one of his friends giggle when he saw me but he was so serious but kind of nervous, also I was really nervous, I lost my focus and I think that had happened to him before as well when I'm close or passing by.. I don't know.
But the point is I'm really confused, I mean I like him and I really want to talk to him but Im not sure if he is really interested in me or I'm just misunderstanding the signals Also I don't know where to start Im really bad flirting and make eye contact made nervous please help
Updates
1 y
I missed a important detail, he is always with his friends, I never see him alone.
Guys, How to know if a guy is interested and what to do if you want to talk to him?
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