"There's a difference between somebody who wants you" suggests that some people may express a desire for a romantic or personal connection with you, indicating an initial interest or attraction.
"And somebody who would do anything to keep you" emphasizes a higher level of commitment, where a person is willing to go to great lengths and make significant efforts to maintain and strengthen the relationship.
In essence, this quote encourages individuals to discern between mere desire and genuine dedication in their relationships. It reminds us that a person who truly values and cherishes the relationship will demonstrate unwavering commitment and effort to keep it flourishing.