My sister is getting on my nerves

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My sister moved out to work 5 hours away when i was 7, she is 10 year's older than me.She never talked to me after she left i would send her post cards or call her and she would never respond. Around Christmas she started calling me and was upset about her boyfriend she has been with for 8 year's.she told me he has been cheating on her with another woman who has three kid's with three different men.She told me she wanted to come see me just because she wants to make him miss her.I told her she could come see me.I live in a duplex and my parent's live in the other end, so she said she would be staying with my parent's.She arrived at 7am and didn't talk to me at all instead she sat texting on her phone and turned the tv on.I wanted to make conversation with her but everything i would talk about she would ignore me or stare at her phone.Then she wanted to go to the store, so we went to the store to shop for Christmas and i bought maybe 4 thing's and she had a ton of thing's in her cart mostly for her boyfriend for Christmas.She then threw them in a pile with my thing's when i was in line, i sorted them and told the cashier those were separate then she said "oh i forgot my wallet in the car can you get those" so i did end though i would have only spent a few dollars.She never paid me back, and i let it go.She left 2 week's later. She started calling me again a week ago and randomly showed up at my house crying.She said she got home from work and her boyfriend was cheating on her in their bed with the other woman and he told her he was in love with them both and wanted to be with them both.She told him he had to pick he said he would pick the other woman if she forced him.So i told her just to kick him out, he doesn't have a job but she has two job's to pay for the house and car's.She won't kick him out, instead she lays around on the couch texting him and laughing at the tv.we went to the store and i made her go in line in front of me this time and she threw my thing's up also and made me pay once again.I went to babysit my other sister's kid and returned home to smell food cooking and she took my entire jug of milk 2 bag's of soy hamburger, soy bacon which i bought ( i don't eat real hamburger/beef or pork) and she mixed it with her real hamburger to make herself some kind of beef gravy for breakfast.She didn't pick up any of her dishes or clean any of the mess instead she sat at the table on the phone to her boyfriend and calling her friend to tell him about her boyfriend.I woke up at 4am and she was still up looking in my kitchen cabinets.when i asked if she needed something she said "no just cleaning this garbage out" and i looked into the garbage can near her and she had thrown away a lot of my food that was still good so i started taking some of it out to save it but she threw away my left over food i had in the refrigerator on top of it.Not only that she piles her thing's (which she has garbage bag's full of) on my family room floor and sleeps on the couch because she doesn't like the room at my parent's house. She told me she called her boyfriend and he was with the other woman at her house but wasn't cheating.I told her she was stupid to believe that and to kick him out but she won't listen to me.My parents told her to kick him out or even come stay with them but she won't.She finally left today and called me saying "she might come back and move in with me" i told her i couldn't have her move in because i don't have room.She said "i can stay on your couch" i really don't want her to but i also don't want to be rude.I try my best to hold in my anger when she is around me. i know that is mean of me to be complaining about her or wishing she would go but she is acting very in considerate. I feel like she is using me to live off while her boyfriend is in their house with his girlfriend spending all her money.I don't think i can handle cleaning up any more of her messes or listening to her complain about her boyfriend.