Firstly, I need to say that I am not some jealous haridan that thinks everyone is after my man. 
I will explain a few recent things that have happened and perhaps you good people will give an opinion if my spidey sense is tingling with good reason.
DH and I been together 15 years, 2 children, v happy, no concerns there. We live in a small village and there are normally various social events every month, some of which we attend some we don't. There's been quite a lot on since Christmas, nothing fancy, a lot of them with the children etc but we have been out more than usual recently.
Anyway, at a New Year bash one of the women who often attends these things with her husband was all over DH like a rash (let's call her Rachel). DH slightly mortified, put it down to too much booze and kept moving away from her (she followed) and rested her hand on his backside whilst standing with him. He moved back to where I was, put his arm around my waist and she went back to talk to her DH. I only know any of this because DH told me. A couple of the other women I know said 'oh it looks like Rachel has her sights set on Mr Mega now' and told me that this is now uncommon and that she has 'form' (their words).
To be honest I didn't think too much of it as it all seemed a bit silly, but since then Rachel has made a real effort to befriend me. She very glamorous, high powered career, pots of money and 'used to getting what she wants' according to her. We are poles apart and have very little in common so I have not actively encouraged anything more than passing the time of day. In the last three weeks she has:
Asked when I would be in so she could pop in and borrow a DVD box set. Then came on the only night I said I would NOT be there, went into the kitchen and started to make herself a cup of tea until DH said that he was expecting a mate round, so she left.
Sent DH a filthy text message (which he showed me) then immediately sent another one saying 'Oops, was meant for Y (her DH), wouldn't want you to get the wrong idea'. Apparently she got his work mobile no from Linked In. Not sure why she would look him up.
Sent him an underwear photo the following day, followed by another 'Oops' then made great pains to come and tell me that it was absolutely an accident. Incidentally their names do not begin with the same initial so would not be next to each other on her phone list.
Last night, at a very casual drinks thing at local cricket club, told him she's been dreaming about him. Again, followed him around like a puppy until he eventually planted himself beside me again which we seldom do, we're normall talking to different people. She then said to me 'Oh Mega ha ha, you must think I'm after your husband ha ha ha'. Er well, actually I do.
DH knows I am posting this btw and says she makes him feel uncomfortable. I am pretty chilled about most things but I think this has to stop now.
So dear reader, this has been longer than I anticipated 
what do you think?