You've heard of The Law of Attraction. The law says that you need to feel like you already have whatever you desire now to attract it in your life.
If it's a car, you go to a car dealership and test drive it. If it's a house, you make an appointment with a real estate broker and take a tour of the house. If it's an object, it's easy.
But, what about something like a happy relationship?
They can be your reference. Then, create your own image of healthy and happy relationship.
YOUR relationship won't look exactly like theirs, but you'll get the idea.
I want you to see and feel it's POSSIBLE even though you never experienced it before.
What happened in the past don't repeat if you don't allow it to be repeated.
Remember, it doesn't have to happen to you just because your parents didn't have a happy marriage, or your next relationship doesn't have to be bad just because your past relationships were bad.
It's YOU who can do something about it instead of letting the history repeat itself.
Find a reference of a successful relationship. Crate your own image, and hold it in your mind.