Every evening my husband took our child out for a walk. One day he forgot his phone and I went to get it – and that’s when I learnt the real reason for his walks.

Motherhood was driving me to exhaustion and my husband seemed to realise this. He took our baby for a walk every evening so I could relax, and it was really nice. I trusted him. But one night he forgot his phone and I went down his usual route to get it back… only to realise it wasn’t usual at all.

Six months ago, I gave birth to our baby boy, Caleb. The transition to motherhood hit me like a goods train – beautiful and brutal in equal measure. Sleepless nights, constant worry, and all-consuming love made my chest ache. My husband Nate seemed like a pillar of support…..

‘You look exhausted,’ he said one evening as he walked in the door from work. His tie was loosened and his shirt sleeves were rolled up. He kissed my forehead as I cradled a fussy Caleb on my hip.

‘So obvious, huh?’ I tried to laugh, but it came out more like a sigh.

‘Let me take him.’ Nate held out his hand to Caleb, who immediately snuggled into his father’s chest. “Actually, I’ve been thinking. You never get a break, Monica. How about I take him for a walk every night? It’ll give you some time to yourself.”

I blinked in surprise. ‘You’d do that?’

‘Sure.’ His smile seemed genuine. “You deserve it. Besides, I miss spending time with the baby during the day.”

That evening I sank into the hot bath for the first time in months, listening to the silence in the house and grateful for my caring husband.

‘How was the walk?’ I asked when they returned, Caleb was sleeping peacefully in the pram.

Nate’s eyes lit up. “Great. Really great. We should make it our business.”

‘I’d love to,’ I said, feeling warmth spill over my chest.

And so it began. Every evening at 6:30, Nate took Caleb out for a walk in his pram. It was a little father-son bonding time and a respite for me.

For weeks this routine continued. I watched from the window as they disappeared down the street: Nate would push the pram with one hand and hold his phone in the other.

He always came back refreshed and energised. I mean…too refreshed.

‘You really enjoy these walks, don’t you?’ I asked one evening as he tucked a sleeping Caleb into his cot.

‘Best part of my day,’ he replied without looking me in the eye.

Something in his voice made me wonder, but I pushed the thought away. I wanted to believe this version of my husband…the devoted father and attentive partner.

‘I’m glad,’ I said quietly, looking at his back as he walked out of the nursery.

Then came that fateful day. It was a normal Wednesday that would change everything.

Nate had just left with Caleb when his phone rang on the kitchen counter. I picked it up and saw his boss’s name on the screen.

‘He forgot his phone,’ I muttered, grabbing my coat. ‘I can catch up with them…they can’t have gone far.’

I slipped out the front door, spotting them halfway down the block. Something made me pause before I called out. Intuition… the same one that whispers when something’s wrong. So I followed at a distance.

Nate didn’t turn towards the park like I assumed he always did. Instead, he headed downtown, leading the pram through the evening crowd with practised ease.

He stopped outside a coffee shop I’d never been to. My step slowed as I watched him check his watch and survey the street.

And then she appeared-a tall, stunning brunette. She was confident in her movements, and her smile widened when she saw Nate.

She leaned over and stroked my baby, then straightened up and kissed my husband on the cheek.

My body went cold, then hot. The pavement seemed to tilt under my feet.

They walked into the house together, her hand resting comfortably on the handle of the pram next to Nate’s, as if they’d done this a hundred times before.

‘This can’t be what it seems,’ I whispered to myself, though my stomach twisted into knots.

That night, I didn’t argue with him. I put his phone back where he’d left it and pretended to doze off when he came back. I needed to make sure.

‘Did you have a good walk?’ I asked, pretending to be tired.

‘As always,’ he replied, not looking up as he unbuckled Caleb. ‘It was nice in the park.’

The lie slipped from his lips so easily that I almost doubted what I was seeing.

‘That’s nice,’ I said, my voice steady despite the hurricane in my chest.

I lay next to him that night, counting his sighs and studying his sleeping face. Was this the same man I had married? Did I really know him? Had he cheated on me?

‘What are you hiding from me?’ I whispered, receiving only the soft rhythm of his breathing in response.

The next night I followed him again, this time deliberately. I told him I needed a nap and watched from behind the newspaper as he met with the same woman in the same place.

This time they were sitting at an outdoor table. I was close enough to see her laughing and watched her fingers squeeze Caleb’s tiny hand. Nate leaned toward her, his smile wider than any I’d seen at home in months.