I dreamed that I jumped into a well. Does this portend anything?

First of all, dreams have no warning. Dreams are just mori memento mori in the brain, including wishes, fears, pressures, desires, etc., which are presented in dreams in a deformed way through the subconscious. Psychological dream interpretation is to interpret these emotions and pressures through communication and understanding. From your simple description, you still have feelings for him, but you want to give up (or have given up) in your heart. Here, death may give up a watch. "No pain in your heart" may mean that you find that giving up may not be as painful as you think.