What if her ex-boyfriend sends her a text message and she still cries every time?

I advise you to take a back seat and wait until she gets his text message and cries before telling her that we should break up. Tell her that I am a man and I will be jealous, but I would rather drown myself in vinegar than make you sad. To love someone is to give her happiness. Since I can't give you happiness, I should give you freedom to make you happy. If you do this, at least let her know that you care about her, and you will be jealous, even if maybe they won't lose touch at once, at least a little, because she knows that you care.