When two people share the same values, want the same things for the relationship, naturally agree on how to obtain those things, and last but not least have a mutual depth of love and desire for one another then love can last.
Compatibility trumps compromise!
Truth be told when it comes to love and relationships most of us (fail our way) to success. If this were not the case we'd all be married to our high school sweethearts!
Oftentimes in our youth we're pursuing relationships without having figured out who (we) are let alone what we want and need in a mate for life.
We allow "impulsive connections" and "happenstance" to dictate our relationship choices.
It's the equivalent of going shopping without a list!
With each failed relationship we gain better insight into ourselves and fine tune our mate selection process along with our "must haves list" along the way. Whatever you felt made for an "ideal mate" at age 17 may not be what you want at 27 or 35.
Couples either "grow together" or "grow apart" over time.
Too many people allow their failed teenage and early 20s relationships to leave too much of an impact on their ideas about love. Simply put they were too young and immature to realize those relationships were likely to fail. The average guy doesn't really start to think about settling down and getting married until he's in his late 20s or early 30s.
The average 20 something year old guy either just left a dorm room or escaped from his parent's basement. He's looking to establish a career, watch sports, party with friends, and get laid!
The last thing on his mind is becoming his parents. The very thought of settling down, getting married, signing a 30 year mortgage, and having children is like watching his life flash before his eyes!
Therefore a young 18, 19, or 20 something year old lady who is emotionally invested in a guy her age is likely setting herself for a heartache. This is a time for exploring and dating for fun.
Each of us (chooses) our own friends, lovers, and spouse.
It's not a case of "love" not lasting but rather choosing the "wrong mate" that kills love. Timing and maturity matters.