You seem to have asked more than one question, but I'm just answering the first.
Yes, "fake it 'til you make it" often works. If you don't love your spouse anymore because he is abusive, that's different, but if it's just that you don't "feel" love for him anymore, "fake it 'til you make it" should and often does work. It's easier to understand if you think of it from the opposite point.
If you keep acting towards each other as if you don't love each other, then you won't have the feelings for each other anymore. If you get so busy or mad or whatever, that you stop taking the time to say kind things to each other, to keep hugging and kissing, and to do kind things for each other, then you will eventually convince your mind and heart that you no longer love each other.
Also, think of it this way, you treat each other with love because it makes you feel good to love the other person. Doing good things for others (for example doing charity-type work) brings a "warm fuzzy feeling" to the giver. Sure, I get a warm fuzzy feeling when someone does something nice for me, but I feel even better when I see the joy or relief in the face of someone I just helped. It's not about what they give to me, but what I do for them that changes my heart.
Another example, I feel more love for my husband when I give him a present than I do when he gives me a present.
Also, when I got so busy with the kids that I started just giving my husband little peck kisses, I pretty soon didn't have any romantic feelings for him anymore. Then I remembered to fake it. So, even though I didn't have the "urge" to do it, I would "make" myself give him a long, sexy kiss. Then, WOW! The result was that I reminded myself what it was like to feel that way. I had to force the kiss to start, but what followed was 100% real.
If you can't see it when thinking of your husband, think of your kids. What makes you happier -- doing something for them that brings them joy or having them do something for you? As long as they aren't toots about it and are actually joyful when you do something nice for them, doesn't that make you feel more love for them? And in return, they then want to do kind things for you and it keeps going.
It's not that faking it makes you believe it even if it is never real. It's the long-term results of faking it. If you can stick it out long enough, faking it will bring back real love. You'll feel joy and love after giving it to your husband, and he (if he is a decent person) will eventually want to reciprocate because of the joy and love he is receiving from you. He'll want to give it back. Sorry to be corny, but it's like the song -- "Love is something if you give it away; you'll end up having more."
I say all this from my own personal experience, but there is also a great movie that makes the same point. I know this movie is fiction, but you might try watching "Fireproof" with Kirk Cameron. The acting isn't the best in the world, but the message is great. The acting isn't horrible, it just isn't movie-star perfect, and you can probably get past that if you keep in mind that Kirk Cameron is the only professional actor in the movie (all the rest are amateurs, and they do a pretty good job for amateurs).
So, just remember it this way...
If ACTING like you don't love each other makes you eventually stop "loving" each other, then it makes sense that ACTING like you DO love each other can eventually make you begin loving each other again.