I hate my sisters boyfriend and it is ruining our relationship. I need advice to see if it will work.?

Me and my bf have been together for 1 year and usually are very happy with each other. In Feb 2008 I made a comment to my bf about how his sister being nasty to me e.g saying 'how long does it take you to scrape all your make-up off, I bet about an hour' or 'Its so funny everytime my brother gets a gf she always gets fat'. I told him about this and he told me that she didn't mean it in a mean way and I am being over-sensitive. About a month after that she made another few comments about me being ugly and without cosmetics I don't really have much going for me and said this in front of his whole family. When this happened I asked her to please not say things like that to me and told her to stop being unkind. I told my bf again about what happened he again said she would NEVER say something like that and if so I should say something to her. I told him that I had spoke to her and he didn't believe me and stuck by his sister. We got back together and she is again causing problems.I hate my sisters boyfriend and it is ruining our relationship. I need advice to see if it will work.?
It sounds like his sister is a b***h. And it doesn't sound like he cares. I personally think that she is trying to get the two of you to break up. Does she say this stuff when he's not around? It's time to stop being nice, girl, or she's gonna run you off again or drive you insane. The next time she makes a comment like that about you being ugly or fat tell her, 'Well at least I got a guy that's good-looking. I couldn't imagine what you do on a Saturday night all alone.' Get downright dirty. She's being cruel and your boyfriend isn't going to do anything about it. So you need to. Just make sure he's not around when you say that stuff, this way you have deniability.

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