The snake in this dream is a large problem with which the dreamer is struggling in real life.
Nothing
A "red snake" would have different significance to different dreamers. The meaning of the dream depends on the tone and feeling of the dream.
The snake is representing someone that you know in the real world.
From my own understanding, snake means someone doesnt like you.
See a psychologist.
In this particular dream, the snake probably is a symbol for something untrustworthy or repulsive. Seeing the ex-boyfriend with the snake, it suggests that those feelings are associated with him as well.
I mean mutulism
The dream snake most likely symbolizes the dreamer's anxiety, or a problem that won't go away. On the other hand, snakes can also represent healing and regeneration. Additionally, the color blue is often associated with heaven, peace or calm emotions. So the dreamer needs to consider other elements of this dream, especially whether the emotional tone is frightened and threatening or peaceful and comforting before drawing conclusions about its meaning.
If that is what you have dreamed, don't worry about it. I can assure you, DON'T WORRY! nothing should happen.
From my understanding it means, that somebody hates you.
It probably means that you have an interest in gambling.