Like an overexcited child, I got back on the rollercoaster and was sick again.

I'm embarrassed to admit to all this after the continual beating I receive from everyone when they've read this site and tell me how stupid I'm being, but I suppose I should stand up and take it like a man.

I went back to her.

More accurately she came back to me. She spent two or three weeks crafting a long love letter to me, splitting up with him (over the phone) and trying to persuade me that I was the love of her life, I was the one that made her happy, I was the one she wanted to be with.

She did a very good job too. She even went to the effort of giving me all the photos she had of them together and all the letters he had sent her (although I didn't want anything to do with them) so that I would truly believe that she had written him out of the book of her life. So, predictably, I succumbed, and we were 'officially', if tentatively, going out with each other again.

Then, equally predictably came the earth shattering lurch, and this time a mere five days later.

On Saturday she had to meet up with him. He had come back to the UK for work purposes and she needed to see him to get her flat keys back so that she could give them to me. And to be fair, I wanted her to see him too, I wanted her to trust herself, to meet him and know that he was behind her, that way I could learn to trust her again.

I had a nervous phone call with her at 10am as she was on her way to meet him, and then....nothing until 8pm. Then she phoned, told me in her small, pathetic, put-upon manner that she couldn't leave him, that all the things she'd said just one week previously had changed, I was secure but not exciting, fun but not exhilirating and that he was the one for her.

If she was a man she'd be accused of thinking with her cock.

I went absolutely ape, screaming, swearing, shouting - a refreshing difference from my normal acts of resignation - I read her letter back to her, I implored her to walk out of the door and into a cab. None of it worked, she's with him now.

Scarily, now, 4 days later, underneath my still bubbling anger, I'm feeling really sorry for her and I want to help her. She's trapped by actions she executes but feels she has no control over, her entire life is being dominated by forces she generates but can't tame. I think it's slowly pulling her apart and it's not pleasant to watch. On Saturday night I was willing her to come to me for her sake as well as mine, to prove she could master herself.

I'm feeling calmer too. I can't take her back now, it's impossible to consider (there's a lurking "unless she...." somewhere, but I can't pin it down) so I can just get on with getting my life back together, and I was doing pretty well before she came back, so it won't take long this time.