In conflicts, if nothing else works, retreat.
Reinforce your boundaries by saying no:
No, not with me. No, not on my watch. No, this is not working for me.
From this safe place, reflect where you contribute to the problem. Watch, adapt, and mellow down
your behavior. Then, if it feels right, move forward again with looser boundaries, and try again or simply wait.
Conflicts are easy to resolve when you are not part of the problem, and sometimes they disappear.
Remember, conflicts highlight our dysfunctional behavior first. Once you correct your behavior, you can freely choose the right action towards resolution. Or you can say: "not my monkeys, not my circus" - that always lifts the spirit! :)