I really don't know why you are so surprised. This is par for the course - a party in for 13 or 14 years, then another party in. It's the way you have done it for years, you vote a party in for a spell, they blot their copybook, you get tired of them and vote the other side in.
You are the only people that voted them in, don't look to blame someone else.
en.wikipedia.org/wiki/List_of_prime_ministers_of_the_United_Kingdom
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