First up a bit of history.
Female colleage of OH went through a break up and used OH as a soubding board for a while. Hes a caring person by nature and gives good advice but after a while she was constantly messaging him at all hours about pointless things. He'd started to ignore a few and then she'd message about work related issues to get a response before going back to personal talk. It was getting ridiculous. So i told him i thought she had ideas on him more than a friend and to watch out and also that it was making.me uncomfortable. He could see the frequency and content of messages were getting a bit much so stopped entering into chit chat with her outside of work but maintained that she wasnt the sort to want to get involved woth someone that had a partner blah blah blah. There was a work night out shortly after and I was invited where she was heard telling a mutual friend that "Dizzapea is only coming because she sees me as a threat" which in my mind told me that she did have ideas about OH otherwise why would it ross your mind. OH proper distanced himself after that and all has been well since.
Until this week when i picked up his phone to check his whatsaap for him and saw she has been turning to him for sex advice and going into detail about what shes been up to with her new boyfriend in his car. Ive told him i find it really inappropriate and that i dont trust her and that again he should be careful aroubd her. It seems shes doing all the running and again if not getting a response then turning to work chat but its really made me angry and upset that hes not putting a stop to it and telling her he doesnt need to hear it.
Am I being a bit mental to have completely lost my shit about it?