Why can’t I say “I love you” out loud?

After my last relationship, I got even more guarded, I was always telling my ex how much I loved him, I was wearing my heart on my sleeve, and he knew he meant the world for me.

But then with my new man who I fell for, when he said I love you, I couldn’t say “I love you too” - I wanted to say it but I was struggling to verbalize it and instead I got my eyes teary… I was feeling it… But I was scared to say. And I got my eyes teary Because I wanted to say it and could not… Later on I forced myself to say it out loud “I cannot develop any deeper feelings than this, because I already love you.”
Does it count as “I love you too”?

Why can’t I say “I love you” out loud?
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