Did rapper's 'Stay Down' song split the couple?

Big Sean and his hit song, 'Stay Down' could be the real reason behind his shocking break up from songstress, … and not Justin Bieber!

According to sources close to the 'Bang Bang' singer, Sean's hot song where he sang about [her] 'priceless p****y' was the last straw that led to their split few weeks ago.

Sean rapped:

I ain't even gonna lie, I got a million dollar chickWith a billion dollar p****y Every time I c*m, I swear to God I feel like I be rich

sources claim Ariana felt humiliated because Sean was treating her like a piece of meat and even her grandmother came to her and asked about the lyrics, which was especially embarrassing.

According to TMZ, there were other reasons beside the song like, Sean claiming she made him pay for all sorts of extravagances. But Ariana sources deny saying, the singer was the one who foot most of the bills, including vacations and private flights.

Sean also complained that Ariana didn't show up for his big House of Blues performance in February because she selfishly cared more about her Grammy's performance the following day. But sources say it was Sean who was self-absorbed after her vocal coach ordered Ariana to not speak for the rest of the day after loosing her voice at rehersals the day before the Grammys, and Sean got pissed.

Ariana then slams Sean for saying she set up the Bieber PDA in Los Angeles just to humiliate him. She calls in 'Bullsh*t', claiming she didn't ask the Biebs to grab her that way.

So, who is telling the truth? This the Sean's second major public breakup in less than a year... remember Naya Rivera!?

Listen to 'Stay Down':