Midnight volatility syndrome attack

I always feel that I never learned from my mistakes.
I knew that opening myself up to others could help me in a way.
Knowing that someone else knows about the burdens I bear.
And having the sense of security that they are facing the same things too.
But opening myself up also leads to bigger chances to get hurt.
Because when I opened up, I let myself to get emotionally attached.
I took the trouble of letting someone know who I am, and getting to know that person as is.
And as a person, I HATE attachments.
It ruins your rationality.
It clouds your judgments.
It makes you think immaturely.
It makes you feel dependent to a certain person.
And the worst things about attachments:
you start to expect things.
you start to assume things to be better than they actually are.
you start misreading the signals given to you.
I am fully aware of these consequences.
I know there are things that I will regret doing.
But I still choose to do them anyways.
What is that?
Is it stupidity?
Ignorance?
Immaturity?
Or simply following my heart?