Good idea or bad idea? My EX girlfriend?

I hurt her really bad by seeming like I don't care about her and messed up really bad. (see other question for details) Im pretty sure I have no chance with her but I hope I do. So would it be a good idea to text her I would appreciate it if you didn't text me for a while because it just hurts and I need some alone time. Or what would be a better thing to say? I love her with all my heart and I want her back so bad. Or what would be a better thing to say? Its okay to txt at night cuz it never wakes her. Were in the enormously pissed off phase btw