heya SB, I know quite a lot about your ex situation but going to try and interpret this as objectively as possible. Although I see this fitting you so well but let's try and be objective.
Water always means emotions to me in dreams in some way. I think it's important as a symbol, how fast the river is flowing. A nice calm river is a different thing. I presume it's fast flowing. also how do you feel about him jumping into the river and never coming back? did you want to rescue him or say goodbye forever?
There is a long history of people letting things go in rivers, from Moses in the Bible to Hindu funerals, sometimes it's not a nice thing but it's a goodbye. Think 6 of Swords.
if you didn't really want him to come back in the river, I think that is a definite goodbye, moving on. but if you worried about him and wanted to help, perhaps that represents your feelings. you worry how he is doing but really want him to float away.
final symbols, the bridge well that is so an emotional transition between two points! and in your dream the thing you want to move on from dived off the bridge!
and the red cup. well we know the cup symbol from tarot with the cups suit. or the Queen of Cups with her cup she gazes into. the nurture, emotion, maybe the representation of intuition. for the red I looked in some colour websites (colour is my *thing* at the moment to learn about). Red can be anger, energy, power, emotion, passion. he dived over with the angry emotions perhaps? you got rid of the angry emotions and the ex and then maybe worried a bit but he was gone! The river forces him away, you don't have to deal with those emotions anymore.
just my ideas, hope it helps you SB
I see this dream as positive really. It's a moving on dream! unless you found it terrifying or really horrible.
lol Fire Cat
at least you didn't throw over a dead body!
