The Chris/Drake beef (in short):

1.) Chris and Rihanna have drama. They part ways.
2.) Rihanna wants to fuck. Rihanna sees Drake. Rihanna fucks Drake; Rihanna wasn't impressed.
3.) Rihanna dumps Drake.
4.) Drake retreats to Temple Hill synagogue, gets council from Rabbi, then writes elaborate candle-light beak-up confessional rap: "Rihanna did to me what I did to other women." He claims "I still love her," he still wants to see her;wants to 'Make Love' to her.
5.) Rihanna wishes him well, but STILL has absolutely NO desire, need, NOR want of/for Drake.
6.) Drake finds yet ANOTHER reason to hate Chris Brown.
7.) The now hurt, bitter, and angry Actor playing Rapper, Aubrey "Drake" Graham, then stews and schemes: "this public humiliation MUST be avenged."
8.) Drake sees C.Breezy in NYC Club. The angry, shunned, unwanted, hurt Drake makes disparaging remark 'bout Rihanna, throws bottle at the then partying C.Breezy, then flees to the shelter of the nearest bathroom.
9.) Drake's bottle-throwing instigation of that bloody riot sent dozens to the Hospital, and has left several women with gory, life-altering wounds.
10.) Rihanna is now even MORE unimpressed; still isn't interested in Wheelchair Jimmy.
11.) Aubrey Graham is now exposed as the weak, conniving, begrudging, brawl-instigating, broken-hearted 'false pretense' that his is.

X,Y,"and Z" - Out..!!