Do I Text My Ex?

okay so i, 14F miss my ex 14M, hes tall curly hair and plays soccer. weve been on and off since august. we broke up around november and we were talking untill i told him to move on in December. then he gave me a letter Re confessing his love for me in February ( weve always been a very serious relationship) ever since he gave the letter ive been thinking about him so much. should i text him? i texted him in November and he never responded but i dont think that matters because the letter he gave me he said he would never lose feelings and that they grow stronger and stronger everyday. should i? SOMEONE PLEASE HELP