Falling in love with ur cousin is kif he iss shorter than u in age and has a small height oris bit poor than u?

hey i actually did nt fall in luv with him its jst that he started liking me and said that ur height has stop growing and mine will grow so dont wory , and he even said i love u to me and consider me as his wife, he wants me to be his wife when he grow up , and promises that when i grow up i would be rich .he talks good to me and is crazy about me and now i have started liking him as well is that ok or i should tell him to forget me.