Lisa Simpson and Milhouse Von Houten broke up because milhouse cheated on her. bart loved that milhouse likes lisa because he can make fun of them. milhouse is a longlie child so he has no on ells but bart. and lisa likes many difrent boys and milhouse and lisa have difrent back storys. in milhouses first one milhouse marries lisa. in milhouses other one he marries maggie. in one of lisa she marries milhouse. the next story is she marries nelson. and the next one she marries wrath. the last one is lisa is single and is not married.