Six of cup indicates that there may be some painful old memories that keep coming back to you. It also means that you may be thinking of some missed opportunities. Let the past be in the past. You need to be in the present in order to carve a meaningful future.
Six of Cups reversed shows that you are thinking too much about old memories. This will do you no good. You should make an effort to start living in the present. Only then, can you achieve something in love.