Boyfriend texted his ex-girlfriend. I'm disgusted. What should I do?

This relationship is very dangerous. Modern men and women like to play ambiguous, as if this can show their charm, and even a little naive and show off. If you like or care about your boyfriend very much, then give you two ways:

1, it's no use arguing with him, which highlights your immaturity (he thinks). Leave him alone, try to make friends with your ex-girlfriend (for example, let him take you and invite her generously), keep him within your control, ask for the phone number of the other party, and embarrass the other party by sending sympathy (don't be sarcastic) on holidays.

2, words and deeds, you can also receive a phone call, you can ask a friend for help (never introduce a third party). This is not revenge (the mentality must be there), just let the other party understand your sadness and finally communicate well. My girlfriend used to be rude when she was with some men, and sometimes she drank the same glass of wine or pandered. I made a suggestion and she called me stingy. What else can I do at the scene?