Say that your friend has told you that your adopted sister is lying and talking shit about you and told people that they asked if it was wrong to hate you.

After hearing all of this with this friend, your girlfriend / boyfriend tells you that this isn’t true after talking with your adopted sister and says that this was all a set up to cause drama between the two of you and hate each other.

Both your (gf / bf) and sibling tell you that this friend has been lying and doing this to you because your sister wouldn’t sleep with this friend. And that this friend has been trying to touch her and send nudes to her and all of that crap.

Who would you believe in this situation and how would you handle it?