The little I know – some great points. Family and friends can often make things worse. Instead of helping the marriage they stoke the flames and encourage war. Same can happen with therapists. Also the part about not disclosing is also a huge one. People don’t want to share negative things about them selves and references don’t want to be responsible for breaking a shiduch. Mental health is another big one.
People know that divorce isn’t an easy way out. They speak to people they know who are divorced who tell them it’s hard
They know what it does to kids. People get divorced as a last resort.