"I don’t understand why she would do something like that," Grant tells New Idea. "She definitely had me fooled, that’s for sure."
"The third or fourth day she got here, we went out and this night – when all this stuff happened – I had people over after going out to a club," Grant explains. "I live in a gated community so I have to go down and let people in sometimes.
"So, I leave my house with my friend Sabrina, to go and grab my friends and bring them back upstairs, and when we walk back inside, we come up the stairs and she is hooking up with this dude."
New Idea claims to have obtained a series of text messages between the couple, with Ali reportedly begging for forgiveness.
"She starts blowing up at me the next day saying: 'I’m so sorry. I was wasted. That’s not me.' And I was like, 'No, I don’t want to see you,'" Grant explains further.
"I told her to stop talking to me: 'I’m about to block you', so that’s what I did, I blocked her and she flew home the next day or something like that.’
Ali is yet to comment on this story.
This article originally appeared on Marie Claire.