This text is grammatically correct. However, you would say: "I was very disappointed." instead of phrasing it as "My expectations have been completely disappointed." You could also say: "My expectations were not met." or "His performance was far below what I expected of him." I hope that helps!

Great question! No, the second sentence is not grammatically correct. The word "disappointed" is an adjective that describes a person's feelings. Disappointed - (of a person) sad or displeased because someone or something has failed to fulfill one's hopes or expectations. Therefore, you would need to use the adjective to describe yourself instead of your expectations. "I was completely disappointed that he did not live up to my expectations." I hope this was helpful.

It sounds a bit awkward try “I expected him to do better so I’m a bit disappointed “ “He didnt live up to my expectations” I would say “I had hoped he would have done better”