A bit of background DH has a group of work colleagues both female and male that he is close with at work, not so much outside work other than the odd social occasion. A female friend on the last few occasions has been a bit more flirty than usual and slightly handsy. Haven't let it bother me as DH doesn't have contact with said person out with the above situations, doesn't text/Snapchat her either and most importantly he moves away from her when she's doing this. I know at work they have to work together mostly in a group but sometimes alone but as I trust DH haven't given this any thought.
The problem is now that the latest social event things have escalated and she was inappropriately touching DH on a few occasions to the point he uncomfortable left. Another close colleague witnessed the nights events and confirmed DH hadn't done anything wrong. (she text him along the lines of X was inappropriate but you done the right thing moving away). Am I being unreasonable for being annoyed that he didn't verbally tell her to stop or pull her up on her actions? Should I just be happy that he removed himself from the situation and told me about it straight away.
Going forward I don't know how to stop being so angry. I hate knowing he still has to work with her and that she will be present at social events. I can't expect him to cut complete contact with her or stop going out to socialise just because she will be there but it irks me deeply knowing despite her disrespect towards our marriage he will still be friendly with her.
Any advice please?