URGENT HELP NEEDED: What does this sonnet mean by Wyatt?

i gave you my love because i thought that we would be happy that way. i didn't expect to be abused like this; i thought you and i would make each other happy. take back the sadness you've given me and the love I have for you. but since you'd rather pretend none of this is true, i'm leaving. Goodbye, i must part from you- you are a fire, and trying to be with you is like trying to plow water and plant a seed in sand.