What on earth I did to get distrusted?

I just recenty overheard a conversation my boyfriend had with his friend. Apparently he's been testing me all along (for the entire 2 years we've been together) and even had his friend purposely asking me out on a date to see if I would cheat.

I obviously told my boyfriend immediately (while being unaware I was being set up) and he was playing dumb all along. Apparently I wasn't the only woman he tested but supposedly the only one that passed.

What on earth I did to get distrusted?
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