I know exactly what you mean, i look at peoples arms and stuff all the time to see if they are doing the same, but at times I think if its just me that does it and that upsets me.
I think that you should ask him, just say something like, "Can I ask you a question?" and go from there. If he is a good friend he will understand and talk to you. You won't lose anything and at least you will know that you tried.
If you need to talk PM me im always here
xx
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