vango I thought Rob plied Jenny with booze to get her to spill re:Adam/Ian and then she regretted it later. Jenny used to dislike Rob because she was a big fan of Jess' and so disapproved of him dumping her/taking up with Helen.
Overall, I do think some characters who seemingly like Rob may not whole heartedly like him. I mean, they may have praised some aspect of his character/job but wouldn't necessarily want him round for dinner. I also think (hope?) that, as in real life, they have formed a generally positive impressions of Rob but never thought about him much really. If/when they hear the accusations of control and abuse, they will put more thought into their perception of him and downgrade their opinion.
Btw, I wonder if the details around the stabbing have been left deliberately unclear so as to add more intrigue/debate for listeners in the coming weeks.