I doubt my comment is even going to be read at this point but I thought this is as good of a thread as any.
There was this girl I met in my 4th year of my undergrad. We had known each other for a while but never really talked. One day, we suddenly started chatting in Facebook about cats for some reason and we hit it off (really random topic I know but I guess we just enjoyed the conversation than the actual topic). Some time passes, we start spending time with each other more and more to the point that our day starts with messaging each other, meeting up randomly to hang out, to talking via messenger till we both fall asleep. No joke was ever flat, no conversation was dull and we never ran out of topics to talk about - we still did share cat gifs though.
As you might have guessed I had started falling for her. Thing is she already had a boyfriend who lived in Germany. For context, we were in Canada. I might not be the most decent human being in the planet but I knew enough to not be a piece of shit and hit on someone else's girlfriend. And she being the amazing and loyal girl she was would never do something stupid either. One of the reasons I liked her so much.
I took her out for a star gazing field trip for her birthday because she was a huge space nerd. We returned quite late about 2 AM-ish and she fell asleep on my shoulder on the bus the way back. That is by far the happiest memory I have to date but being me, I couldn't even bring myself to hold her because she wasn't single. Even being intimate with other girls never had the same effect. I woke her up when we arrived back and she apologized for falling asleep on me. I walked her home and did my best to not make too much of it.
We continued to spend time together till the summer of the year when she was going to Germany to visit her SO. I finally realized that spending time with her knowing that I can never ask her out was slowly killing me inside. So before she left, I told her how I felt, that I never intended to act on it since she was in a relationship and that I needed space to get my shit together. She said she understood but became distant. Tried reconnecting a few months later with her as a friend but she never responded. I took the hint and we haven't talked since.
Sorry for the long pointless story but just wanted to share my happiest memory. If anyone bothered reading this, thank you. Hope you have better luck than me when you find the right one.