My partner of 5 years misrepresents my words and deeds?

My relationship is is tatters because my partner cant keep his word and talks about me behind my back and says things that are not true or that have an element of truth but he manipulates what I say and is always trying to make out that I am dreadful. He posts things on this site about me in such a way that people reading his questions will always side with him because he misrepresents my words. His latest is that he thinks that I may 'take him' for half his house when we break up. I have paid �400 per month for the first 3 years plus food and all my love and energy building a home for us. The ped 2 years I have only been able to aford �50 a month plus food and all my housekeeping (the cottage is spotless although he tells people its dirty!!). Why does he treat me with such little care, I have asked him so many times to stop talking to work friends about us and stop back stabbing but he doesn't and his betrayal is really upsetting me. Basically I have been loving for two people