How can I find out if my boyfriend is gay? or at least hi? and maybe not into me?

Me and my boyfriend have been together for 4 years we don’t have sex and never have and we don’t kiss anymore either. I don't know if he’s just not into me or if maybe he’s gay I don't know it’s kind of weird to be in a relationship this long with nothing. I’ve seen him look at other girls and look up pornstars on Instagram but yet I’ve also seen him look weirdly at guys. I noticed that when we even watch shows that gave gay guys or gay scenes he will flip out and get mad and tell me to change it and say he ain’t watching the show anymore etc etc. I don't know if that’s a normal reaction or what but jw what other people thought
How can I find out if my boyfriend is gay? or at least hi? and maybe not into me?
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