"親愛なるあなたをペンとして愛するのはとても簡単でした"

Simplified Meaning:

When someone says it was easier to love you as a pen, they mean it was simpler to have feelings for you when they were writing about you, not interacting with you in person. Think about when you write a letter or journal entry; you have time to think about your words, plan what to say, and express your feelings without interruptions or misunderstandings. For example, imagine a poet who writes beautiful love poems to someone they admire. On paper, everything seems perfect because they control the story and emotions. But in real life, dealing with the complexities of a real relationship—like arguments, misunderstandings, and daily challenges—can be much harder. To apply this idea to your life, be aware that idealizing someone from a distance or in your thoughts is different from truly knowing and loving them in person. Real love means accepting and dealing with both the good and the difficult parts of someone. This way, you avoid disappointment and build stronger, more genuine relationships.