Why does your boyfriend keeps texting his ex girlfriend?

The reason could be one out of a hundred reasons or a combination of some or all of them. The more important issue here is what you are going to do. If he is capable of doing this, I would strongly recommend you think about whether a continued relationship with this individual is appropriate. Personally, if indeed this is taking place, I would run and don't look back. There are just too many nice men out there that would love to put you on a pedestal and cherish you. Do not make your future miserable with some one who's integrity will always be in question.

Viper1