How to confirm if my husband is gay?

Hello It may sound like a common question but is there a way to figure for sure if my husband is gay or bi? Going by some discussions ive read, i do see some signs. He has gay friends. We've been married only a few months and he is never really interested in sex. Ive never seen him check out girls. If at all he does, he notices the makeup or finer nuances. I feel he's gay or bi. Ive tried discussing with him but he laughs it off. I expect him to be angry about my asking but he vaguely dismisses it saying im struck to this thought. About our not having sex often he says it isnt a big deal. Ive been fighting a lot. At first i fought cuz i felt he didnt love me. Thats obvious. But now i feel the crux of this loveless marriage is his wanting to show me off so hes never percieved as gay. I feel disturbed if this marriage is just a sham from day1. Please advise.

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