Grant claims Ali proceeded to "flirt with his friends" and "flat-out ignore him" just hours before walking in on with a male friend at his home.
The former reality star told the publication, "This is what was happening right? I told her flat out, I'm not one of those people where I'm dating you I'm going to be all over you in the club. I don't need to be holding your hand every five seconds."
"It's just not how it works. It doesn't have anything to do with how I feel about you."
Grant further tells that Ali was allegedly "all over him" the night in question.
"Because she was like all over me, all the time and she (needed) to chill," Grant told Daily Mail. "People know that we're with each other you don't need to be grabbing me every two seconds...it's kind of a lot."
Ali is still yet to comment on Grant's claims.