I have a romantic relationship with somebody I've only met in my mind

To introduce myself: I am about to be 22. Artist. Autistic. Grew up a lonely child. Never been religious. I have never experienced a romantic relationship where I truly, truly loved somebody. Except for one, but it has only existed in my mind. At the same time though, it doesn't exist in my mind. I know that out there, there is someone who loves me just as much I do them, but I don't know their name, what they look like, or who they are. But I do know them. We do know each other. We have conversations, I can feel their eyes on me, I know their smile, and I can even feel their physicial touch, most prominently their hand holding mine. This feels like squeezing warmth, kind of like the tendons and muscles (basically all of my hand, I guess) are surging with electricity. I'm always getting that feeling you get in your heart that's kind of like unfolding or blooming, then lit on fire, and hugged all over. I can feel their presence basically everywhere. It's as if I have somebody walking by my side, or like we are handcuffed to each other. My whole life I've just felt warm and giggly inside because I know that out there far, far away, there's somebody who loves me very much and is looking out for me. And yes, I thought at some point I would grow out of this but really it's only become stronger. I've spoken to my therapist on this and from her point of view she doesn't have any concerns, but she didn't have any clarifying insights on this either because she has never encountered my condition before. But she did bring up that because I grew up so lonely that it's not a shock that I would find a connection or create an imaginary friend like this, which I agree with her. Unfortunately, because I daydream about this person so much, I don't have dreams of them while I sleep. That's why I want to get back into meditation (haven't done so since high school) to find answers about them or my condition. I also thought it would be a fantastic idea to turn to lovely strangers on the internet for advice and finally ask what I've been thinking for the past 17 or so years. Is there a term for what's going on with me? I don't feel that twin flame or soul tie really fits, and I guess calling us soulmates is fine but that's usually reserved for people who actually know each other, plus it doesn't explain my phantom senses and otherworldly connection. Have you encountered similar stories or have had something like this happen to you? I would greatly appreciate any and all input. I am open to all questions. Also, if there's a subreddit that I could be directed to that's related to my experience, or if this post would be better suited over there, please let me know! Thank you for taking the time to read my post xx. I look forward to hearing your response.