Why does he tell me his embarrassing stories?

-He told me a story about how he peed his pants at school and told everyone it was water so people helped clean it up
-He told me about how his braces hurt so much that he stopped brushing his teeth so when it was removed his breath smelled like death
-He told me about how his fly was open and the zipper was broken the entire time during prom night
Is it bad that he tells me these types of stories when it's just the two of us?
Are we just friends cause he's okay with me knowing about his disgusting things?
Why does he tell me his embarrassing stories?
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