Brother in Law chatting me up, wants to be with me!?

Since he made his intentions very clear I suggest you stay away from him and you may not want to but you need to tell your husband what he said and did. The only way to put a stop to this is to face it directly he was flirting at first but those last comments and the smack on the A$$ crossed the line. Your married to his brother, but he is still a man and he is attracted to you...