It's hard to keep me up
Despite his girl’s infidelity, she tries to keep Abel for herself without admitting to him what she’s done. The passion the two once shared in intimacy no longer exists. This is due to the fact that since someone else now provides her the sexual pleasure she specifically desires, she can’t even get intimate with Abel anymore or turn him on.
It’s even worse now that Abel’s making love to a mistress of his own. As seen in the next line, he can’t turn on the cheating girl either.
(This line may also be heard as “hard to keep me up”, as The Weeknd sings in a live performance of this song. The meaning is still essentially the same, however.):
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