The Republicans have lied to me and I believed them going all the way back to 2010 when they said,”Elect me and I will repeal obamacare.” Now, I do not believe anything they say.
Unfortunately they have to be watched like hawks. I speculate that like Hastert many of them have stuff in their past they don't want to get out. Unfortunately the power structure finds out and holds it over their head.
Honor is something that is in short supply in our elected officials and so you are correct not to trust them. But at the same time what was your choice? Some democrat who you know will vote leftist every chance he/she gets or the slime Republican who might keep his promises 50% of the time.