This woman is using you. She doesn’t want you as a boyfriend — she’s made it very clear — but she does keep you on the hook by texting you all the time and telling you what a special friend you are to her. She is not someone who has your best interests at heart. If she did, she’d realize you’re in love with her (you proposed to her, after all) and that to keep you on as a friend is giving you false hope and hurting you.
My advice, as hard as this may be to hear, is to forget about her altogether, and find someone to love who is local, single, available and loves you back — as a boyfriend, not as a friend.