Why did he laugh at me?

I had an appointment with my therapist earlier this week and we discussed commitment issues. I figured out that I fear commitment because to me it signals growing up and that my freedom would be gone (religious upbringing/parents). I told my boyfriend while we were hanging out and he laughed at me. He said it was stupid for me to fear aging since it will happen anyway and no amount of me trying to fight it will make it go away. He thought I had much deeper issues than that? He seemed almost relieved that it was "a simple issue" with an "easy fix". My therapist and I were discussing commitment issues because I'm worried he's gonna propose soon. I wanted to work on some of those issues while I still had time.

Why did he laugh at me?
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