These are not signs of emotional maturity or intelligence, because there are some things that you should get upset about (an unfaithful or neglectful partner, for example).
Specific situations demand certain reactions, and this idea of people being “too much” or “crazy” is destructive because it causes you to act fake and pretend that your partner’s hurtful actions don’t bother you.

Being “chill/cool”

Thus, you should give up the hope that you can be flawless and put together every day in a relationship.
That idea is not realistic, puts you in a continuous state of feeling that you're not good enough, and can stop you from developing real confidence in yourself.

There is no such thing as the ideal partner

In relationships, there is usually one partner designated as the emotional rock. The risk with this: always being there for others can sometimes make you forget to take care of you. 
The challenge is figuring out how to encourage your partner while holding on to your own identity and individuality.

Being supportive

Learn how to regulate your emotions: cry, scream, get angry, but then calm down. 
This way you’re exposing your partner to the way you really are, to what upsets you, and how you handle and resolve your feelings. The right partner should still love you once you open up in this way.

Emotion regulation

To foster a long-term, supportive, solid relationships, it's important to recognize your flaws while still holding yourself and your partner in high regard. 
Start by freeing yourself from the outdated notions of how an exemplary partner should behave.

Supportive, long-term relationships

You are allowed to make mistakes, search for yourself, and not have all the answers about who you really are. 
If you begin a relationship on the supposition that you have everything figured out, you are setting yourself up for failure later on: Your relationship will be developed on unrealistic expectations, and your partner may be resentful once you reveal your true self.

There is no such thing as the ideal partner

Similar ideas to There is no such thing as the ideal partner

How to spot the real thing

7 Tips for Saying No Effectively

One on one meetings