I broke no contact. How do I un-break it, perchance?

So, a few weeks before I graduated from college, I got into my first ever relationship of any kind, as this girl and I liked each other a lot. BUT, we actually can’t officially date since we live super far away outside of school. We agreed that once I graduated, since she had one more year as a junior, we’d stop talking.

However, we still kept talking 2 months after I graduated over text and phone calls, but I unfortunately got kinda attached. I mentally thought of her as my girlfriend, even though she REALLY REALLY isn’t. Because of this, I told her that I should stop talking to her for my own mental health. It was sad. She cried over the phone, and I nearly did.

Now, today after 3 weeks, I texted her again, we’ve been talking, and now I’m back to being in an unhealthy loop of thinking I’m in a relationship. Please someone help me snap out of it.