You might want to examine what it is saying about you. What you want, what you need, what it is you think this person will do for you, your life. What in you will this person fill up or add to ?

I recently had a very hard time with this. It wasn't romantic or sexual, but there was a huge emotional void in me that I thought this person could fill up because this person had tapped into some things, awakened some needs and desires in me. For me it was/is a desire for the mothering I never had and I think a desire for closeness, non-sexual intimacy that I have no idea how to find or take part in.

It took a long time to deal with it. I was miserable for months and months. Could think of little else and felt frantic when I didn't think of the person or when I realized we were separate in spite of my trying to connect the distance with constant thoughts about the person. I spent hours paralyzed with obsessing, I missed work, I bored and drove nuts those around me who knew about it, I fell apart when I imagined the person abandoning me... .So exhausting. When I found a therapist I could talk about it, she accepted that about me and just let me talk about how frustrating it is/was and it helped so much.

I don't know if this helps but I hope so. I know how consuming it can be, even if you are not wanting it to be.