<human>: We are both in high school. Dated this girl for 3 months. Everything seems to be going great. She is pretty popular and I am not exactly.

My sister is a junior in our high school and tells all her dumb friends that she makes me do all her laundry.  This is actually true but it is because my mother has me do laundry as part of my designated lists of chores.

Well it spreads throughout school that I'm in love with my older sister and kids say things like "I do her laundry just to be close to her" and other gross weird things like that. Well my girlfriend overhears it and she breaks up with me for being gross (when I really didn't even do anything!).

I have already brought it up to my total bitch of a sister but she laughs at it. My sister's boyfriend who is the same year as her told all the older grades that when my sister doesn't want to do her chores she dumps them on me and I will do it all smiles and gumdrops because I love her like that (which is absolutely NOT true!)

Is there anyway to get my girlfriend back?

She isn't really talking to me right now so I guess my main question is how to clear this jank rumor, but also how to get my ex to talk to me again so I can explain?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Girlfriend broke up with me when sister and her boyfriend spread a rumor. How do I explain to ex it is all exaggerations and rumors?