Sean 'Diddy' Combs Believes Cassie Cheated on Him with Personal Trainer: Source

Sean “Diddy” Combs’s ex Cassie Ventura just went Instagram official with professional bull rider Alex Fine but the relationship may not be as new as it appears — at least Diddy Doesn’t think so.
The music mogul, 49, believes Ventura, 32, cheated on him with Fine, a source tells PEOPLE. Ventura just introduced her new beau to her followers on Saturday when she posted a photo of herself and Fine sharing a kiss on the lips.
But Fine and Ventura have know