What to do if your partner is in a codependent relationship with someone else?

Recently my partner and I broke up. I found out via his friends ex that the reason why was actually because of her ex. Her ex had been pushing my ex to break up with me since November (which I felt was going to happen because my ex does everything his friend does). He is so codependent on his friend that everyone sees it: his friends, my friends, and even their followers on Instagram (they are famous influencers. I had fans reach out to me asking what happened because they felt that his friend was the reason behind the breakup. It’s so clear that people who don’t know us, even saw it.)

My question is, has anyone saw this issue before? And how do you make them break out of it?

What to do if your partner is in a codependent relationship with someone else?
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