Made my bed, lied in it, then you slept with me
This line is going off of the famous saying, “You made your bed, now lay in it”, which means you made a particular choice and now you have to live with the consequences. Taking it a step further and sleeping with ASAP, she has thus committed to having some sort of relationship with ASAP.
“Lied in it” could be a refernce to how she lied to him before acting on sex
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