Admitting defeat or keep trying?

About 6 months ago I sent a friend request on fb to an ex gf from 2 years back and it took her around 2 days to finally accept it and we started talking on fb messanger. She was hesitant to accept it but did so. She said something that really made me believe that she truly missed me. I made a big deal of it asking her if she really still cared about me and she said yes. However I messed up and took things too far telling her I still really love her and I really miss her and she got mad and said goodbye again to me. I want to try again on to friend her on fb and maybe try talking again but is it better to just let the love of my life go and admit defeat or keep trying?

Unfortunately you can't make someone love you if they don't.

That's the thing, she did admit to still caring about me and really missing me. Just looked her up on fb again and I can't send a friend request. Words can't describe my depression right now. Knowing that someone cares and loves me and I can't even talk to them

I've made up my mind. I'm not going to accept defeat, I will keep trying until cops show up and arrest me.

Don’t condemn yourself for expressing your feelings. There isn’t anything bad in it. You can’t fight against your feelings and I swear you that it’s healthier to love than even being loved.
I know what you are going through. I also need to know if I’m welcome to the other person’s life. I mean, I need to know if I have approval and I’m liked.
Then I told me: No way you can control this. Any attempt on your part would be a castle in the air.
Whenever you ask the other person for reassurance or need this reassurance, you are condemning yourself to be a prisoner of your own insecurities. No other way out.
And on the other side, the other person...place yourself for a moment in the other person’s shoes. Which options does (s)he have? You would feel between the sword and the wall, right? Telling the truth and cope, maybe, with not cover the other person’s expectations. Telling a partial truth to avoid hurting feelings?
The only way is to set yourself free working on whatever your struggles are.
I know this last is the easy answer and everyone knows it but it’s the only way. I swear. You deserve to be yourself and being each day less dependent on others. Because, you count, as any other person.