[blkmat]

My sister met my boyfriend before I ddi as I wasn't in the country and they became best friends. When I finally met him all three of us got along so well as me and my sister are really close. He went away for three months and when he got back we realised we had strong feelings for each other so we ended up getting together.

At first my sister hated that we had got together and said that I had ruined things for her but she eventually came around to the idea and we all got along well.

She has her own house given to her by our parents and my boyfriend lives with me and my parents. My parents are hardly there as they have brough a property abroad.

The thing is, my sister is over my parents house (despite having her own house) pretty much every night and its not like she wants to see me as she only texts my boyfriend asking to come over. He feels he can't say anything to her as its her parents house which I think is fair enough.

Because she is constantly there we never get any time alone and this had caused a huge wedge between me and my boyfriend. She also crosses the line sometimes by openly walking around in front of him in knickers and bra (mind you she has a fantastic skinny body and you couldn't say she wasn't beautiful) which makes me very VERY upset that she would cross boundires like she does.

Her always being there has also resulting in us two resenting eaqch other as I want time with my boyfriend and she loves to compete for his attention and make it clear to me that they met before we did.

Us arguing has put a huge pressure on mine and my boyfriends relationship and he threatens to move out if we argue again but he will never stand up for me if my sister is out of line but if I say something to her he is the first to jump in and tell me I'm wrong.

Its got to the point where I've been close to a mental break down and it just isn't fair. She has somewhere to escape to (her own house) but I don't. I wake up and she's there, come home from work and she's there. Go into my room and she's talking to my boyfriend.

What should I do, we have already discussed moving out to our own place to get some time to ourselves but I think she will just turn up unannounced.

This is driving me crazy! Please help or if you have had a similar problem, what did you do?