No way did he take a dive, he stood to gain so much here if he won: gets his swag back after the Mayweather L, take's khabib's 0, gets the belt back, gets the whole MMA community nut-riding him again and probably calling him the LW GOAT, gets an excuse to leave for another year or fight GSP for the 165 belt.
Now by losing he's got people talking like he's a washed up Ronda 2.0, and his popularity might take a dip unless he fights again soon-ish and beats somebody. Also look how sad he was at the end, you can him say to Dana after the melee something to the extent of "I don't care about that shit, i'm upset I lost"