I've been dating on and off for 30 years, and it's not easy is it?
(It doesn't get any less complicated, either.)
I think I do have one advantage, when it comes to dating. I grew up breaking horses
When you ride horses, you are going to get thrown occasionally, no matter how good you are. It is inevitable. If you date, you are going to like people who don't feel like you do.
You need to watch a rodeo. When a cowboy get's thrown, he gets up, dusts himself off, picks up his hat, and walks out of the arena with his head held high. That's all you can do in these situations. Things like this are inevitable if you date.
If she wanted to date you, she would have returned your message. You can't argue a girl into dating you. If you look like you're running after her, she will respect you less.
If you arrange a "chance" encounter, however.....
FYI, I went to high school and college with a girl that I tried every way to get somewhere with. It wasn't until after college that we hooked up. She approached me after I had long since given up. Sometimes, the answer isn't no; it's "Not right now."