I have had a dream that my boyfriend has been with other girls including his ex.? What does this mean?

Nothing.

Neurons go *bang* in the night and that is that.

Well, maybe its not exactly *bang* but they go nuts and we try to interpret the nonsense.

Hi, pardo,
Did you mean to post in the Psychics Category?
Anyway, I am not a Psychic, don't pretend to be.
Here is a link about dreams:
http://kidshealth.org/kid/feeling/thought/nightmares.html
I know you are not a "kid", but the link gives some good info about dreams.
Dreams are usually about what you think about most of the time during a day.
If you concentrate on something during the day, chances are your sub-conscious will cause you to dream about it, in some fashion or other.
It could be that you don't trust your boyfriend!
I do wish you the best, and good luck.

Hey just wanted to say sometimes I do the same, have dreams about my boyfriend and other girls! This is not him this is you! Dreams are things you have through about within the last 2 weeks, even if it is something that has slipped through your mind, everything stays in your head, your dream is made up of this, are you feeling insecure about your relationship with him? Do you not trust him? These are things you have obviously been feeling for you to dream that way! Don't let your dreams convince you that he is, or make you believe it will happen! This is all in your mind, and it is something you need to figure out, and stop thinking it otherwise you will make yourself believe this! Goodluck