While a romantic partnership can offer much, people can grow and learn from non-romantic relationships as well. Andrew Sullivan says it best when he questions why society emphasizes romantic love over friendship:
Friendship uniquely requires mutual self-knowledge and will. It takes two competent, willing people to be friends. You cannot impose a friendship on someone, although you can impose a crush, a lawsuit, or an obsession. If friendship is not reciprocated, it simply ceases to exist or, rather, it never existed in the first place. … friendship delivers what love promises but fails to provide. The contrast between the two are, in fact, many, and largely damning to love’s reputation. Where love is swift, for example, friendship is slow. Love comes quickly, as the song has it, but friendship ripens with time. … we don’t “fall in friendship.” … For friendship is based on knowledge, and love can be based on mere hope… You can love someone more than you know him, and he can be perfectly loved without being perfectly known. But the more you know a friend, the more a friend he is.