It's like if I compared my burning passion to a stove similar to the ones the old coal trains used to have. They kept the door open to release some of the pressure but at the same time kept adding logs to the fire to keep it alive. Also the guy in front of it would have a hardship because he would be sweating and stuff, but he would keep doing it. In a kind of weird masochist way that's how I view myself and see love too.
I love to love, even though it's one of the worse hardships there is I'm just this guy in front of a fire trying to ignite it with a box of matches in a dark wood in winter. Each time I use a match I feel its heat and feel comforted by the hope that it could bring me eternal heat and well being. But I have to wake up from my daydream because if I don't then the fire is going to consume the match and burn my fingers. And during a bit of time I will still have the pain reminding me of my mistake. Then if I just throw the match in the fire it's not going to do anything apart from burning on its own. I have to prepare the fire well and make sure everything is correctly in place and ready to make the chain reaction it's supposed to. But then if still with these efforts the fire doesn't start, I will have to use another match, but as I do the same thing happens again and even something else, the amount of matches in the box diminishes by one.
Putting the pressure on me as I know that I don't have unlimited tries. But for a second let's suppose I have unlimited tries, that each time that I take a match out another one appears inside the box. Will my efforts be the same in both situations? I don't think so. In the first one, the closer I am to the end of the box the more careful and considerate I'm going to be. And at the end of the match box, I will have to go out of the forest, face the cold winter and bring another box of matches, and do that over and over again until I succeed. For the box which doesn't empty it would be more of a will tester as I have as much tries as I want, how long will I try until my will starts to fade and the hope goes away? And if ever that happens, I just have to take some rest by the unlit fire and making it burn inside me on dreams. Also there is one less hardship to overcome as I don't have to face the outside cold winter. My dreams by the fire will be enough to make me want to try again when I wake up. 
Then in the event that I managed to lit the fire, the first flames will bring with them a burst of joy and warmth never felt before, only in dreams. Then I'll have to maintain the fire. Give it proper care in order to make it grow stronger, go take more wood. First just next to it to make sure to still have an eye for the fire while I care for it. Then when all the near wood is gone I'll have to go farther and leave it be on its own. Which makes me sick worried. What if it dies before I come back? What if it starts to burn a nearby tree? So I go very fast, in fact I go as fast as I can. And when I get back the closer I get to it the better I'm feeling, I first start to see a faint light, then a more distinct one. Then after a while I start to feel its warmth again which makes all my worries go away and makes me think that I was stupid to think like that and that next time I should take more when going to search for spare wood.
Each time I'm throwing a log to the fire it makes this crackling sound, so to say "Thank you for caring about me" even though it's just a sound, you understand it or so you think you do, either way it makes you happy. In the case of the emptying match box, once the fire is started you'll proportionally be more happy with its first flame depending on how much times you had to go out in the cold to bring a new match box. It will also be the case with the maintaining of the fire, though another variation will kick in this time. You'll care so much for the fire that you wouldn't want to leave it because you remember ô too well the hardship you went through to lit it, and to some extend when all the nearby wood will be gone you'll be so terrified of leaving it alone, that you'll try every technique you know, you'll use every piece of ingeniosity yo have, but on the long run to no avail, as you'll watch the fire loose its intensity progressively, and finally let it die, because of being too afraid to let it alone.
This fire is the one I feel inside my heart. Outside the cold is the one I feel when I'm alone, when you're not here.