Kelly Pritchard, 29, from Derbyshire shares her story:
Mornings in our household were hectic. I had five kids to organise, but somehow, every day I made it to the school gates on time. I always enjoyed chatting with the other mums there, too.
Just then I saw a familiar face dropping off two little ones so I went over.
โHi Finlay,โ I said. โDo you fancy going for a coffee?โ
โIโd love to,โ she replied.
She had kids of a similar age and we often went for a coffee or lunch together.
Recently our conversations often focused on Finlayโs love life โ or rather the lack of it.
She had become a single mum and was struggling to find anyone new.
My heart really went out to her. It made me feel so lucky. I was married to Allen and he was wonderful. Weโd met years before through work. Heโd been great with my son, Troy, from a previous relationship. After a whirlwind romance, he popped the question and we got married soon after.
Nine years and four more kids later, we were happier than ever.

The way they were: Kelly and Allen were childhood sweethearts.
โThe perfect lifeโ
We had regular date nights and Allen helped out with the school run at times, too. Nothing was too much trouble.
On the few occasions heโd come home and Finlay was there, Iโd almost felt embarrassed by my own happiness. I didnโt want to rub her face in my perfect marriage.
A few months later, it was my birthday and Allen bought me tickets to a show called The Ladyboys of Bangkok. โItโs not my cup of tea, but I thought you could have a night out with your mates,โ he said.
I invited Finlay and some other mums and we all got glammed up.
We had great night at the show and afterwards we went for drinks in the bar.
A few wines in Finlay got emotional. โYouโre so lucky,โ she said to me. โYouโve got a brilliant life.โ
I knew she was right โ but I hated for her to get upset about it.
โThings will get better,โ I said. โYour dream bloke is just around the corner.โ
That night I snuggled up beside Allen in bed as usual. He seemed distant, though, and didnโt cuddle me back. It was unlike him.
Over the next two weeks, his behaviour got stranger. He was hardly ever home and kept telling me he was going to his dadโs.
One evening I was round at my friend Beckyโs* house when I noticed she was looking uncomfortable.
โWhatโs wrong?โ I asked her.
She wouldnโt meet my eye.
โLook, Kelly, you really shouldnโt be so concerned about Finlay,โ she said.
โWhat do you mean?โ I said. โI just want her to meet a nice man.โ
Becky went red in the face. โBut thatโs just it,โ she said. โShe has found a nice man.โ
I stared, confused. Becky looked like she might cry.
โThe man sheโs seeing is your Allen,โ she said quietly.
I shook my head.
โThatโs impossible,โ I said.
I had an urge to laugh but Beckyโs face was deadly serious.
โItโs true,โ she said. โShe told me. And some other mums.โ
My mouth dropped open. Finlay had acted like a mate and given me a sob story about her love life. But in truth, sheโd been getting it on with my husband and telling my friends all about it.
โI have to go,โ I gulped.

Kelly couldnโt believe her ears.
Rage bubbled inside me as I drove home.
When I walked in, I found Allen in the kitchen. He was smiling until he saw my face.
โWhatโs wrong?โ he asked.
โTell me the truth,โ I said. โAre you having an affair?โ
Allen just looked at me and laughed.
โItโs what Finlayโs been saying,โ I went on.
There was a long silence. I was willing Allen to tell me she was making it up, but he didnโt.
โIโm sorry,โ he said.
I broke down sobbing. How could he?
I didnโt even realise Allen knew Finlay. Sheโd been round the house once or twice but the pair of them had barely spoken. Then it hit me โ some months earlier Iโd been sick so Allen had done the school run. He must have got talking to her then.
All of a sudden, I was furious.
โGet out!โ I screamed. โI canโt stand the sight of you.โ
He looked bewildered. โWhere am I supposed to go?โ he said. โPlease, letโs talk about thisโฆโ
โThereโs nothing to talk about,โ I said.
Eventually, Allen went to his dadโs, as I cried on the sofa.
I felt so stupid. There Iโd been telling anyone who would listen how I felt sorry for Finlay and wanted her to find a man, and all the while, sheโd had her claws into mine.
I mustโve looked so stupid.

Both declined to comment.
The ultimate betrayal
Over the next few days, I tried to call both Allen and Finlay but neither of them picked up.
Then I got a text from Finlay: He messaged me on Facebook she said. He chased me.
It was no excuse.
The next time I saw Finlay at the school gates she looked through me like I wasnโt even there. A few weeks later I found out she was living with Allen โ and they were engaged! I couldnโt believe it.
Now, while Iโm left looking after our kids, Allen is off playing dad to Finlayโs.
Looking back, Finlay was always so envious of my life, itโs no surprise she stole it.