Anyone else have a friend that won't stay single?

My friend won't stay single. She's 17, and keep switching between like three guys. She'll obsess over one until she drives him crazy and he doesn't want to see her anymore, then she'll cry for like 4 days straight, then she'll just move on. She always says that shes "loves" these guys, but I doubt it. You can't love someone one week, then not the next. I wish she'd just stay single for a while so she could sort her life out. Anyone else have a friend like this?