Then you must not have voted in many elections
In politics .. though they may try ... not every politician can deliver on all their promises
I've voted in many for by national, state and local positions. If a Republican is elected and then governs as a democrat then they don't get my vote - the (R) next to their name doesn't mean that they automatically get my vote.
Again, it may be a crazy concept, but republicans that govern as demcrats don't get my vote.