I can agree that man's lady can be negatively influenced by her friends/family IF she allows it...
There should be a firm understanding that whatever goes on with a relationship stays within the relationship...
It's understood that some things will be shared or confided in, but that shouldn't influence the outcome of a relationship. If it does, then that may be a cue to reevaluate said relationship and decide if the relationship should end or not..
This is why for me, I keep my romantic business off of social media and I don't speak on my relationship to others too much, if @ all. But, if I do speak on it, then it is primarily positive things. No negative stuff and no disrespect behind my lady's back.
Single and miserable people will keep other people single and miserable. A wise person will recognize the real and keep their business to themselves..