From the cited article...

... Sen. Lisa Murkowski said she feels "cheated" after she won a concession in the recently passed tax and spending law to protect wind and solar projects, only to see the president and his administration issue recent orders that she said seem designed to quickly quash such projects.

"I feel cheated," she said in an interview Friday. "I feel like we made a deal and then hours later, a deal was made to somebody else." ...

She was not "cheated," she was used.

Why did she even think of believing Pres Trump?

imo, she let her constituents down. Big time.