So many beautiful, loving and wise words on this thread. I really like it.
I will try to explain my answer, in my own words...Not so easy ... such a loaded, deep feeling, central and motivating part of life that is the most life-altering transformative force-for-good, that I know.
I am assuming it is the eros kind of love that is in question here? Being entwined with lust ...lust being primarily biological, the urge to do what the body is designed to do, really, to motivate us, and/or trick us into procreating.
It worked a treat for me, I ended up birthing 7 humans.
Also limerance can be a forerunner or a companion of "love" - the crushy, infactuatey, delicious hormone- cocktail, loins-stirring obsession.
I had that with my current partner, after a short while of knowing him, but it wasn't immediate ...the first thing was, we could talk, it was flowy, effortless, engaging, mutual interests and compatible points of view.
The "falling in love" was like being struck by warm, blissful, uplifting, transcendent lightening. It was looking at him and really SEEING him, looking into his eyes I could "see" the light and warmth and aliveness of his soul. I felt safe, wondrous, transfixed, transported...
But it took friendship to create a foundation for a long term, sustainable relationship.
We are both PTSDy; lots of relationship trauma, having long term abuse, and violence perpetuated upon us, so the trust took a long time to build.
Especially on his part, he was very relationship and woman-shy, very burnt, very hurt, as I was, but I had this major crush and lust and infatuation thing happening that made me a crazy bitch.
Not bitchy, but definitely "madly in love" as I was very, very unwell at the time, maniacally, acutely, devastatingly ill, on many, many levels, but not nasty, not dishonest, not disrespectful. I was cracked, beside myself, not sleeping, in constant physical agony, and I was A LOT to handle. Too much for him.
I forgave that though, I wanted the friendship much more than any control, even though I lusted for him something chronic.
It took time, self control, individual responsibility, lots of honest communication, deep courage, heaps of patience and consideration for the other, maturity that comes from being a commited parent (we both brought children from previous relationships into the relationship) the understanding and compassion born of deep suffering, that we recognised we both deal with/have dealt with for the better part of our lives.
Truly that understanding and compassion is the glue, that and the willingness to grow, to truly reveal ourselves to the other, to not inflict suffering outwards, but to be attentive to the others signs, needs, moods, failings, incapacities, no-go-zones, or at least not-yet-zones.
It is a gracious growing and seeing the other as a sovereign being who chooses, and who's right to choose is sacred and immutable.
A deep respect for the obstables surmounted and the time needed to surmount yet more obstacles and being allowed to fail, get things wrong and have the other honestly and kindly support and give the grace needed to learn to truly thrive. Something like that, anyway...:-)