How does healthy love feel?

I see couples every day, in every form. I breaks my heart that I'm 42 and single. I've lost hope for myself that I'll every have a healthy relationship. When I actually gave it some thought, I discovered that many of the relationships that I observed weren't healthy. Not the kind of existence I would want with a partner.

At the same rate, I see healthy, happy, functional relationships; I grow Hulk green with envy, yet I feel pride and happiness for the pair. I want to know what does a healthy relationship feel like? How does it feel to be the primary person in another's life? What does the love bond feel like after the orgasm glow has faded, and lust takes a back seat to honor, pride, respect, value and trust.

What is it like to know that you're the source of electric surges down the spine, the tingle in the stomach, and the anticipation of know that someone waits for you and your presence? I've watched couples that walk into a room, and everyone knows that the emotional bond is strong, concrete, and stable. The complaints are minor and no one needs to change. I want to know what does it feel like to be first?  To hold another's hand, and the sensation is one that you crave, and never want to end. The calming comfort of a partner must be incredible.

No relationship is perfect; I'm aware of this, for as humans, we're not perfect. How does it feel to know that if there's a problem, the other individual means enough to you to correct it, make adjustments, and repair the weak parts to make it stronger?

If love is needed by all, how does healthy love feel? Since I'm alone, and expect to remain that way, I'm just curious and would like some feedback.

                                                                        Thank you for your time, Jadailha