Stop being so senseless. Seriously. The phrase, "falling out of love" is a completely unfounded phrase that has absolutely nothing to do with actual love. "Falling in love" and "falling out of love" are feelings that come about as a result of whatever is going on your relationship at that moment. The first date, or even the first few months, of the relationship you feel all giddy; get butterflies, etc., and you feel as though you're "falling".
But then there are disagreements. Stress. Finances. You'll break each other's hearts from time to time. Life happens, and you will FEEL as though you're are "falling out of love". What YOU need to realize is that love is a choice, not some magic force that chooses two people and forces them together against their will. I didn't even understand this until I started dating my boyfriend, now fiancee. We had an awesome first couple of months. And then he started challenging me to be better; to change, and it scared me. Certain personality traits I didn't even know I had started rising to the surface, and it made our relationship really rocky at times. And I would get selfish. And then there were times when he truly would be in the wrong, and it hurt. so I'd get really upset and angry and feel like, "I don't want this emotional stress!" And I would think I was "falling out of love".
But I realized that, no matter how hard it is, you MUST lead your heart. Unless the relationship is abusive or something, then there is NO reason to say that you are "falling out of love". If this is, truly, someone you couldn't live without(and in my case, I knew I could not live without him), then you'll realize it's not all about you. He may be your boyfriend, but you are also his girlfriend. That means its a fifty-fifty road. You can't just claim to be "falling out of love", and expect people to feel sorry for you. Get up, and do something about it, if you really love him. As far as passion goes, it's a feeling. It will NOT always be prominent. But if you're worried about that, then do something to reignite that passion. Don't just sit there and allow it to dwindle; be spontaneous.
My fiancee and I like to get away from things, sometimes. My family is over dramatic(hence the reason I used to be) and it's nice to get away from everyone. Do things you wouldn't normally do; play miniature golf, go to a museum, go to a concert, the movies, a really nice dinner, a ball, a dance, hang out with friends, etc. Whatever it is that can get you away from normal life so you can focus on each other, do it. Also, to help him(because you never know what he's feeling), maybe write him a love letter? A poem? A song? Draw him a picture? Make him a card? Take him shopping and have him pick out an outfit for you to wear. (Yes, I just said that) These things will make him feel wonderfully special, and will inspire him to do things special for you as well. They will also remind YOU how much you love him, and want to be with him; how much you want to please him. All around, very good things. My fiancee and I do this all the time, and it continues to bring new life to our relationship. I can go to my closet and say, "Hmm...what do I want to wear that I know he will love?" And the look on his face when he sees me, in the shirt he picked out, makes me feel like the luckiest girl in the world.
If you really love him, deep inside, you'll find a way to pull that love to the surface. And you know what'll happen when you do that? You'll get feelings that are even better than butterflies. Everytime I see my fiancee's face, my heart beats so much faster and harder, and I realize that I have been given the greatest opportunity in the world; to love someone completely. Hard times will always come and go, but as long as you lead your heart, you'll gwt through them and be a better person for it.
And by lead your heart, I mean you ACT and THINK on what you KNOW, not what you FEEL. If you know you love him, act like you love him, remind yourself you love him. And you FEEL like you're loosing that love, act like you're not. Becuase guess what? YOU'RE NOT. Don't get so focused what what USED to be normal, but instead look forward to what lies ahead for you; make your relationship fresh and new. Do things for him, romantic things, that you've never done before. Remind yourself, and even him, of the beginning of your relationship, and a new love WILL wash over the relationship.
But if you really love him, and especially if you can see yourself marrying him, you have to learn to lead your heart now, or your marriage could end up down the drain.
You're not falling out of love. LEAD your heart. IGNORE the stupid feelings you keep focussing on. And FIGHT for what you love.