I am sorry to break the news, but most relationships where one partner is bipolar fail. A bipolar will quickly dominate a relationship and also destroy it. The partner of a bipolar individual would have to be comfortable keeping the peace, tolerate dominant behavior, and continuously walk a tightrope. A partner and their children can have to spend an inordinate amount trying to please the bipolar individual, which quickly wears everyone down and leads to divorce.
Of course, it all depends on the individual. Some bipolars are very tolerant people and can handle relationships with ease, but this in not the norm.
If both partners are bipolar the relationship could potentially work as long as both individuals aren’t manic or depressive at the same time. The problem is that one partner can emotionally trigger the other bipolar partner to cycle, and the relationship is mutually destructive.
Before you consider getting into a relationship with someone who is bipolar, make sure that they are receiving treatment and make it a condition of the relationship. If you are bipolar, don’t destroy someone’s life and seek treatment so that you can have a stable relationship.