I know you're rolling hard with it, don't lie
I know it's got a hold of you
He knows that she is rolling off of an ecstasy pill (great time to whisper sweet nothings in a girl’s ear..) She’s denying her feelings towards him, but he knows she’s rolling with her feelings towards him. Sometimes when a woman begins to fall for a man and hard she will deny it especially when it would boost the man’s ego to know he got her.
He’s also comparing his ability to make women fall in love with him to being on ecstasy. Hence the “rolling” suggesting she’s hitting her high of him.
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