Let down

/ˈlet.daʊn/

fail to support or help someone as they had hoped or expected: "if I let him down now, I knew he'd never trust me again"

Resentful
/rɪˈzɛntf(ʊ)l/ feeling or...

Betrayed
/bɪˈtreɪ/ expose (one's country, a group, or a person) to danger by...

Angry
/ˈaŋɡri/ adjective  Feeling or showing...

Emotions Wheel
I have enjoyed working with the emotions I found in Plutchik, but there are so many more...