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If this WAS the case, then I'd be incredibly suprised to see that their have been no animal studies in this.
I would imagine this would be because of the difficulty of proving an animal is in love.
As far as I am aware, love is an emotion that science doesn't know very much about but logically one would assume that it is to do with a range of neurotransmitters and impulses. Therefore, it is fair to assume that like anything in the brain - repeat use of those pathways leads to a stronger feeling and therefore something that is very similar to addiction. I wouldn't however say it was down to dopamine alone.
However there are many who would believe love is more than just a neurological stimuli and there is some deeper meaning in it.
As for breaking the addiction - this tends to be what happens a lot of the time. If you look at most men when they break up after a long term relationship they normally "recover" by doing lots of things - work, sport, drinking. It is just replacing one stimulus with another. Normally it also takes about 20-30 days to start feeling "alright" again - oddly enough this is about the amount of time it takes to stop a habit which is essentially what is happening (your brain is in the habit of thinking about your ex and how happy etc etc whatever).
Most people though tend to start to balance out their new addiction over time - mainly because the habit isn't as strong and therefore new interesting stimuli grab their attention (the new hot girl/guy or something).