Asking the husband for divorce if he takes a second wife

Q: My question is about second marriage. I have very good relation with my husband and his family. My husband loves me and our two daughters. My in-laws think that I am an ideal wife and ideal daughter in-law , however, my husband says that some men need more than one wife and recently he was seriously thinking about second marriage. I told him that if he wants a second wife, then he has to divorce me first. I have no problem with his getting married for two or three times but I do not want to be his wife in that case. He said he cannot leave me. As I know him, he loves me but he needs more wives as well. What would be my situation in Shariah if I refuse to keep marital relations with him?

Zakaat on the sale of a property

Q: I sold a plot of land in March 2016 and paid Zakat @2.5% of the total sale. From the sale proceeds I purchased another property in August 2016. As per the sale agreement, a down payment was made and the balance amount would be paid in July 2017. My question is that do I have to pay zakaat on this amount also?

Breaking one's oaths

Q: I have done something that I swore by the Quran, that I would never do again, but I still do it. Then after I did it I swore again that I wouldn't do it, but then I still did it. I know that this time I will never do it again, but I feel like Allah doesn't love me, or trust me, or has forgiven me. And it has been horrible pain. Please someone help me. What is the kaffara for breaking an oath?