ما هو حكم مساعدة صديق في إعادة علاقة مع خطيبته؟

If the intended relationship is to mediate for reconciliation and to accept a suitor who was rejected for a non-religious reason, then there is no harm in that. However, if the relationship means being alone with the fiancée (khalwa) and going out with her, then this is forbidden by Islamic law, and aiding in it is aiding in a reprehensible act and a sin.