Okay, I've read through here and I'm ready to join you.
Potted history: Was in a long term relationship with DP, but due to his reluctance to commit, we broke up. While DP and I were on a break, I met someone, it was very intense and I loved him very very much, but it was all very messy as DP and I were still living together (but separately) and then this new man met someone. A little further down the line, DP and I got back together and he became my DH. In all honesty, I still thought about the other man, but had accepted it was over. However, we worked together so I did see him sometimes, and there were a couple of occasions where he tried to put the moves on, and I turned him down (very, very difficult).
At the end of last year,he got back in contact, and we started things up again, but after a couple of weeks, he ended it, which I was sad about but also relieved as I was in so much turmoil about walking away from my marriage. I concentrated hard on my marriage, the OM and I were no longer in contact and I gave up socialising. I still missed him so much. Throughout this time, DH and I have had a few problems, largely centred around the fact that since we got married, I have wanted to start a family and he is reluctant.
Last month, OM sent me a message through Facebook to ask if I was going to a mutual friend's barbecue (I was) and was I going alone (again, yes). Assumed this was just him checking whether my DH was going as he probably wouldn't have gone if that were the case. I walked in, saw him and, well, I knew I was done for. Things started up again and have been pretty intense for a month. I want to finish it because I know no good can come of it, but I've just been addicted. I don't want to end my marriage over just sex. Very mixed messages from him which I know means he isn't at all bothered; has called it off for a few days, has said it isn't going to amount to anything, but then we've also had a weekend away together and spent alot of time together. I was away with work (not with him) and he phoned and texted a lot, including asking 'why can't I see how great together we are' - I bloody well can.
This weekend, my DH has been away. He's such a lovely man, but I haven't missed him. I know I need to do the right thing and end my marriage. Coincidentally, OM has also been away and while I got a few text messages, these have dried up which I know means he's met someone. Him being away has been torture, I miss him so much. So I think it is over and I need to go no contact.
Congratulations if you got this far. I just wanted to introduce myself and give my story.