We r in nineth year of our marriage but I still feel alone,he loves me but he don't express it properly,we are not having good sex life,I don't understand but he is not interested in sex he is so much busy in his works he forget what is love. Sometimes I need sex badly but he is not interested in that I m so frustrated and due to this we often fight that makes our relationship weak

Have you told all this to him? The reason I ask is that many times it happens that people don't realise a partner's feelings and feel that things are going smooth. Everyone has physical needs and you are no different. Talk to him and take the initiative. Start getting the romance back and plan some couple time. As long as you know he's a good man and is caring towards you, please go ahead and make the effort.