homewrecker
someone who your boyfriend says you shouldn't worry about then a week later winds up with him, typically known as pulling a Maddie.
girl 1: I hate that girl, she's a homewrecker
girl 2: why? what happened
girl 1: my bf went on a trip with her for school and...
girl 2: oh snap, did she pull a maddie??
girl1: yes im gonna kill her