Yes, I do believed in forever, if you have the right mindset to it. In order to achieved forever with your partner it requires a proper behavior. I'm not an expert of love advice, I only shares my ideas base from my circle of confidence and knowledge.
"Ego" a relationship killer
Don't enter in a relationship if you are only thinking for yourself, it don't make any sense having in a relationship if you have skyscrapers pride and a selfish behavior. You will only hurt your partner in the long run, having a relationship is all about contribution with your bf/gf as a love team you're willing to cooperate and provide time, energy and resources to develop emotional needs.
"Judgmental person" cripples the relationship
Since human being are emotional driven person, we tend to judge our partner without thinking rationally and without giving them the benefit of the doubt. So the next time if you have a dispute with your partner don't attack them with your nonsense judgment, but identify the problem and what should be done to prevent it from happening again.
"Victim mentality" creates a wound in a relationship
Blaming your partner will never solves issues in a relationship, but produces more of it. Don't fall from a victim mentality it will degraded yourself as human being.
Rules before marrying your partner:
Don't marry a person if you're not ready; psychologically, financially, emotionally, and spiritually.
Don't forget rule #1.