I don't think this it "just a phase" in fact, thats what called me out most. As you mentioned, he has probably done LOADS of research. I came out as Bisexual to my mum on my 12 or 13th birthday. I told my mum to not tell my dad either, why? because he is slightly homophobic, he would kick me out of the house. I decided to tell him when i was 20 and got a house already. I suggest you go on and see how it goes, if he stops liking boys then it doesn't mean he isn't pan.
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