I think I know what you're trying to get at here, but the different metaphors you use are a little confusing. I think it would make more poetic sense if you changed your metaphors a little, particularly the one involving the dog and the flea. I think you're trying to go for a positive message here, but relationship between a dog and a flea is not symbiotic: the flea feeds off of the dog. Technically the pearl/oyster relationship is like this too: a pearl is formed when a grain of sand or some other irritant is trapped in the oyster's shell and the oyster forms a coating around the irritant to protect itself, so it's not a very symbiotic relationship either. These one-way, parasitic relationships detract from your ultimate message, which I think you intend to be a little more upbeat, judging by the last line. (Sorry to be so picky - I'm a pretty tough critic.) You have some good idea, though. Keep writing!
I love the fact that you compare yourself to a dog. That is such rich irony. The fact that you compare the girl you love to a flea though???? Not exactly romantic. But still very joyous.
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