Can't stop thinking about someone not sure what i should do...
A few years ago I was in a relationship going stale. To be honest I'm not sure why I continued past the first month, I was kind of an idiot, there were fun moments, but that's besides the point. Towards the end I started talking to someone I knew as a simple acquaintance online. Soon conversations would get longer, we'd talk on the phone, and I became more interested in speaking with her than the girl I was actually with.
It got to the point where I told her I had feelings for her, and she said she felt the same way. We began sending letters to each other and it just got deeper and deeper. Eventually, as these things inevitably happen, my actual "gf" found out and we broke up. This obviously did not go well with the girl I had feelings for because she didn't know I was in a relationship.
Now its been years later, we don't talk much, but for some reason starting last week I cannot get her out of my head, to the point where I'm getting somewhat depressed and lethargic. I've spoken to her and told her how I feel about her, and that I would give her the space she needs. She's with someone now too.
I'm not sure what to do. I know this is just a phase, but there are things in life that tell me I should continuously focus part of my attention towards her. Is this normal?