He lied to me for a three whole years

So i was just hanging out with my fiancee, and i got to thinking about his older brother, so i decided to ask him about him. He never really talked too much about him. Told me his parents disowned him because his mom had him with another man and that he would always steal money from them and they were just tired of it. So apparently he moved to florida and stopped talking to everyone, even my fiance and he seemed pretty broken up about it. I have some family in florida so i had been wanting to go and visit them but ive been holding off on asking him because him and his family 'refuse' to go there with the off chance they see his brother there. Here's the thing though, HE'S BEEN LYING THIS WHOLE TIME. He doesn't have a fucking brother. Doesn't fucking exist. Took him A LONG ASS TIME FOR THAT TO COME OUT .

THREE YEARS BITCH I CAN'T, WHO IN THEIR RIGHT MIND

Meanwhile, im going through like 80 emotions all at once, which im sure his ass could see on my fucking face. And i look at him and go to leave and he has the balls to grab me and hug me and whine saying i can't tell his parents. I'm trying to wrap my damn head around this but what the fuck how does someone do that