Expectations.

“Expectation is the root of all heartache.”

― William Shakespeare

As you get closer to someone, you tend to lift up your expectations towards that person because you think that since that person is everything to you, you are willing to do anything and everything for that person and that person will do the same back.
You expect that person to do what you expected them to do because that person understands you so well.
But sorry dear, we aren't mind reader.
Yes, we do understand you - your personality, character, likes, dislikes, etc.
But no, we've no idea what you expect us to do at a certain point of time.
It's two completely different things.

The higher the expectations, the greater the disappointment.
Having lower or no expectations at all and you'll realize that hey, actually they already gave their best and that's enough. Unless they totally don't give a sh*t about it then please do give them a tight slap as a form of reminder.

And this post is about expectations towards people, not towards your goal(s).
Don't mix it up.
Set high goal(s) and achievable objectives along the way towards your goal(s).
Stress is healthy but don't overstress yourself!