So I made this friend online. We had both used the same forum for a few years. Her online personality is sensible, kind, caring and smart. DC's similar ages. She is seperated and her ex can take her kids for days at a time as he works from home and has no problems doing that.
We started emailing every day, met up (live in different towns) but she turned out to be a lot different to how she portrayed herself. She is really mean with money. I invited her to mine for a girls night in to cheer her up when she was down. 2 days later I had a job to get rid of her. Her ex had the DC's. Literally had to drive her to the train-station as she was settling in for THIRD night. 
If I had anything to do she wanted to come with me and she drank every DAY
Then she insisted I come to visit her. I did while my DD was in scotland with her GP's. I thought it wouyld be a nice break. It was headwrecking. She talked incessantly about herself and her recently failed relationship from dawn til dusk. It then transpires the fella was in a relationsip when she met him. A fact she chose to omit when she posted her story on our forum and got loads of unwarranted sympathy for. (Made out he used her when all along it was clear he was and he never said anything else was on the cards) Anyway when i got home I decided to scale down the friendship. I didn't want any more meetups as I had enough on my plate and felt she was high maintenance and a bit deceptive.
She has pressed and pressed for another visit to me. She keeps suggesting things going on in my town and keeps suggesting meet-ups. But that is just her code for staying at my place and freeloading and being impossible to get rid of. I've been quite clear in refusing these 'meet-ups'. (Her favourite trick is to order drinks at lunchtime so she can't go home and has to stay another night) There is no such thing as meeting up for lunch, she wants to come to stay at mine.
Anyway, so I had got over that and downgraded thre friendship to penpals, she was still asking a couple of times per week to come up. Anyway during the time we were friends she was talking to a bloke online. Turns out he's in a relationship 
-she didn't seem to have any qualms about this. Made out they were just friends in the same type job but turns out they were flirting and online all day every day. These facts only come out by accident.
Anyway now it turns out she casually drops it into an email to me that she is talking to another lad who is married (when I say talking I mean all day morning until well late into the night) I am just sickened. She makes me sick and I actually have just cut her dead since. I can't even bother going through the charade of 'phasing her out'. I just havent answered her mails or logged back into the forum (used to use it every day)
It is so awkward, I now can't go back on the site where I used to hang out a lot. It's really annoyed me. If she sees me log on she will bombard me with pm's.
I don't care what people do (well, evidently I do) but I have no sympathy for bottom-feeders like her who target married men. The thing is later when it all goes tits up she will be on the forum again telling cock and bull stories and looking for sympathy.
AIBU to never email her again and never explain why?