There seems to be a bit of confusion going on here. As you've discovered, Malus varieties, of which your crabapple is one, vary as to whether they're self pollinating or require another pollinator nearby, but the purpose of pollination is for fertilization of the flowers if you want fruit. Without fertilization, the flowers fade, as they usually do, but without forming any fruit. This particularly matters if the Malus you are growing is actually an apple, grown only for its fruit - many of those require cross pollination to crop, but this is not true of crab apples, yours should produce fruit all on its own. There are a few varieties of crab apple which are sterile, that is, they never produce fruit, but the one you mention isn't one of those.
Even a variety of Malus which requires cross pollination certainly does not die without it - it will continue to flower year on year and be healthy, barring other infestations, infections or disease, just not producing fruit.
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This particular tree will pollinate itself without any help from you (though bees and air movement do play a role). Pollination does not increase the length of time the flowers are present - in fact, once fertilization has taken place, the flowers may fade slightly more quickly, since their purpose has been served.