What does this all mean? Could someone please explain it to me?

"I've been acquainted with a guy online for almost two years. We communicate regularly, but sometimes he disappears for a week or even a month. Whenever he disappears, I feel indifferent. However, when we haven't communicated for a while and I suddenly feel sad or angry thinking about him, he always contacts me within a few days. This has happened repeatedly.
What does this all mean? Could someone please explain it to me?
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