Is it a red flag / suspicious that my boyfriend won't' go to his high school reunion and doesn't have contact with ANYONE from high school?

So, my boyfriends 10 year reunion is coming up, he didn't even mention it to me I just found the invitation in the rubbish bin and asked him about it, at first he got pissed at me for reading his mail, but then told me he doesn't have any contact with anyone he went to school with, he was bullied and so cut all contact and doesn't want to go, and I really want to go, it sounds like a great night but he's refusing, and I'm just a little suspicious why he's so adamant, what do you think?
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Okay, maybe I was overreacting, thank you people
Is it a red flag / suspicious that my boyfriend won't' go to his high school reunion and doesn't have contact with ANYONE from high school?
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