Masturbation within the context of a relationship serves two purposes. First off, it serves as a bridge of sorts. It's very very (very very) rare for two people to have the exact same sex drive. If I want sex every day and my lover girl wants it every other day, then I can always just rub one out on the off days to keep myself happy without her having to do something she's not overly interested in.
Quite apart from that, it does serve as 'me time,' as has been noted and explained already.
In either case, the only time it's unhealthy is if it begins interfering with other aspects of your life, be they social, professional or sexual.
I'd wager your fiancee was already having doubts about her performance in the sack. Her overreaction to your masturbation is more to do with her than you. You might try suggesting that couple's therapy would be a good idea; it generally is before tying the knot anyway, since any minor issues you have now are more likely to get worse after marriage.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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