Yes it is possible. My grandparents were together from their teens until my grandfather died at the age of 78. My grandmother never remarried, and died at the age of 93. They fought all the time, but they supported each other in everything, were very considerate of each other in matters that were important. They were a team. When he died, I have never witnessed such grief as my grandmother lamented over his coffin, crying things like "who will make you breakfast now?". She was thinking about him even in death before herself. She adjusted and healed, but he was the only love of her life.

They escaped World War 2 together, after being separated by war and finding each other again in a refugee camp. He could never return to his home country, and would never see his family ever again for the rest of his life. They moved to a country where they initially didn't speak the language. They didn't just love each other, they needed each other for survival. They rebuilt a new life and family in a new country. They forged everything from nothing together.

They valued each other in a way that people don't value each other today. Media teaches us very unrealistic ideals about what "perfect love" should be. There is no "happily ever after", because life is rife with challenges that we must face and learn how overcome on our own and with others. Some things are easier in partnership, but long term things will only work out if they both look at life through a realistic lens. When one or both partners feel entitled to "perfection", they will be constantly disappointed, questioning whether the grass is greener in another situation or relationship.

We've been cheated by social pressure supported by media to believe in perfection as a goal for our relationships. There has to be a certain amount of sex, and it must be good sex. There should never be more than X amount of arguments. We should have mostly similar goals, dreams, likes, and dislikes. We must never change. The list goes on and on, but it isn't realistic. We are all individuals, and we do evolve, adapt, and some of our interests and approaches to situations will change over time. Our bodies are going to change too, and some things may not work as well as they once did, if at all.

What does not change very much at all is the essence of who we are - our personality - that which comprises our core values, morals, and fundamental beliefs. If you are someone who truly believes in fidelity, you will never cheat. If you have integrity, lying is not something you engage in or accept. These are the things that must align in a relationship for it to work. If you assess yourself and your partner and find that your values, morals and beliefs are in alignment, and accept that the your relationship will change in its intensity over time, then your relationship is worth the effort and you should do everything you can to work together and maintain it.

Sharing a life with another person is a privilege, it isn't a right. When you make a long term commitment to someone, you are setting up expectations and entering into obligations and responsibilities that neither of you would consider doing alone. A decision to split up should be mutual, and after long, careful consideration because while you may not be experiencing that ideal of "perfect love" set out by social expectations, what you have with this person may just be the best you will ever find in a partnership with another human being.

Some people just aren't built for commitment, and that's OK too. Knowing one's self, and being honest about who you are with others is probably the most important part of having healthy relationships. Honesty and a true understanding of one's self and owning who you are will indicate whether or not they are capable of committing for life. Someone who goes about life chasing after ideals, modelling different things to please others, and not being true to themselves is not going to enjoy long-term, successful relationships, because they will never know what truly makes them happy.