In the Eminem song Spend Some Time who is Eminem speaking of?

he wrote that song with 1st time writing it was called 1 night stand he changed some parts and it turned into spend some time but really he was speaking of well any 1 cause it was 1 night stand

it is said that his verse is a mix up of his feelings for kim and another girlfriend of his marissa cirrilo. he fell for birth, and they both played him (kim kissed another man) marissa (cheated) yet he still felt love for both of them.