you know relationships arent all black and white and only the 2 people in the relationship know what the deal is, so no one out side cn judge. when me and my ex broke up, all i got was shit from my friends cause they told me he was an asshole. yeah he was a jerk for ending it, but he wasnt to me during the relationship. my friends couldnt understand that, they keep putting their 2 cents in about everything, so finally i just stopped telling them when i saw him or when he called me. it just none of their business. So what i am saying is, instead of getting involved, just listen cause the person complaining to you is usually just looking to vent and sort things out in their head. if a lil shit is talked who cares, 100% of the time it isnt meant, they are just angry and frustrated. if you happen to be friends with both parties, seriously seriously just keep your ear open and your mouth shout, regardless that keeps the drama to a very very low minimum