Stoicism and Ambivalent Friends

Curious as to some readings that might help dealing with an ambivalent friend.

These are friends that give very mixed feelings and drain you of your energy, focus and time. There are good times and bad times. Good conversations and moments of being ignored. These are tougher than toxic relationships. You can easily handle toxic relationships, but with these, there are things that keep you from moving on from them (both perceptional and in reality).

I have a story. But won't get into, the story doesn't matter. Currently, I just know the relationship is exhausting emotionally and mentally. How would a new stoic handle 1) such an up-down friendship and 2) their own feelings of resentment and frustration?