Dreaming of ex boyfriend is considered bad as per dream interpretation and meaning. Ex crush or ex boyfriend getting married in dream is also an indication that in near future you can expect some kind of accidents or relationship issues.
Dreaming of fighting with ex boyfriend is a sign of some kind of illness or bad happenings in the family. It might also mean you might face stress or depression.
Just only seeing ex crush means there will be accidents.
Dreaming of ex boyfriend in romantic situations means you will successfully overcome all the problems.
Please note that the dream has to happen naturally. If the dream happens after having some ex boyfriend related scene during day time then it has no value. The dream is merely an extension of the daytime activity.