Matthew 16 shows us that one way to manage toxic relationships is to set healthy boundaries in the way Jesus did with Peter. You might need to tell that person that you won't let them talk to you or treat you in a toxic way, or you may simply need to tell them that you are just not going to go to a toxic place in your relationship with them.
21 From that time on Jesus began to explain to his disciples that he must go to Jerusalem and suffer many things at the hands of the elders, the chief priests and the teachers of the law, and that he must be killed and on the third day be raised to life.
22 Peter took him aside and began to rebuke him. “Never, Lord!” he said. “This shall never happen to you!”
23 Jesus turned and said to Peter, “Get behind me, Satan! You are a stumbling block to me; you do not have in mind the concerns of God, but merely human concerns.”
24 Then Jesus said to his disciples, “Whoever wants to be my disciple must deny themselves and take up their cross and follow me. 25 For whoever wants to save their life will lose it, but whoever loses their life for me will find it. 26 What good will it be for you to gain the whole world, yet forfeit your soul? Or what can you give in exchange for your soul? 27 For the Son of Man is going to come in his Father’s glory with his angels, and then he will reward everyone according to what they have done.
28 “Truly I tell you, some who are standing here will not taste death before they see the Son of Man coming in his kingdom.”