I can recall different scenarios when either a close friend of mine, or either someone whom I've randomly heard about, would complain about the toxic relationship/marriage that they're in, but for one reason or another those people would refuse to get out of the unhealthy relationship.
What causes a person to remain in a toxic relationship or marriage?
Some people just want to hold onto what they used to have. They remember they good old days of the relationship, but they never truly seem to care about how negative the relationship has really become.
Fear would be a big reason why one wouldn't leave a relationship. Anything else would be one of those issues of not wanting to give up what you have, even though it would be extremely difficult to change it.