Relationships are easy to fall into, chemistry works and the feeling is electric. To maintain them requires work, quality time, and mutual respect. I believe a joint project or goal is ideal to focus on.
Most of us have taken great people for granted over our lives. That is sad. We have looked for things other than what is in our hearts. A real recipe for loneliness unless we learn.
In short most of us just want to love and be loved, the trick is how much effort are we prepared to put in?