Is this gunna ruin my realaationship?

the only way to end the drama with twin 2 is to tell him maturely that you're really not interested in him but hope to get along. then whatever he says to retaliate, ignore it and move on. tell twin 1 how you feel about him and stop getting into arguments with twin 2. you don't want it to seem like you're fighting with him because you like him, do you?