Lance is your pathetic mess of an ex boyfriend. Both of you are unhealthy, instable, mutually codependent people who probably should have never entered a relationship in the first place. You fed into his issues, he fed into yours. He broke things off and left. 

Mere weeks later, he has come crawling back, ready to fall back into misery with you if it means being loved again. He is not above playing up the kicked puppy act to make you pity him into taking him back.