Everyone in a committed relationship has an obligation to make the partner feel safe from infidelity.

His behavior is a major fail.

The time and emotions spent on her should be yours. Right now you are sharing him.

His behavior is selfish, entitled, likely deceitful (as to his intentions or sex), and shows zero empathy to you.

Most men would not do this to a woman they loved. You can't change him. Don't argue or explain any further with this selfish jerk.

You deserve better. Ghost him and block this jerk on everything.