Are the toxic friends responsible to sabotage our relationship or it my ex’s fault for not having boundaries with his toxic friends?

His friends had an agenda on me specifically my ex’s closest friend not to let him date me because they felt I was a treat to them since he has feelings for me and finally decided to have a serious relationship with me.
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Thank you!!
Are the toxic friends responsible to sabotage our relationship or it my ex’s fault for not having boundaries with his toxic friends?
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