In the run up to Valentine's Day a series of myth busting confessions will be emblazoned on billboards from Camden Town to Dalston.
"Sometimes I lie in bed with my boyfriend and think about my ex," will go up outside Camden Town station.
While "I’ve spent almost half of my life with him…I love him, I do. But I know he’s not the love of my life," can be spotted in Clerkenwell Road, Farringdon.
While out and about with her two children, she would chalk a website on benches and pavements in Primrose Hill or Hampstead Heath - inviting anonymous tales of love, and relationships.
To her surprise she got a trickle then a flood - and over the years has collected 1,500 true stories, choosing 250 for her book It's Complicated.
"It started at this weird time when people were separated and forced to stand two metres apart wearing masks," she said.
"I used my daughter's chalks to write this URL and thought if enough people saw it, maybe a few would be curious enough to share their story about their love life.
"On the first day I got two stories and it just kept going, and spread globally with some coming from Australia."
Philippa says the anonymity is vital to offer a "counter-narrative" to images of perfection.
"It was a time when social media was very performative with couples posting curated edits and glossy highlights and people at home comparing their lives.
"By gathering the truth and posting it back I hoped to offer a more nuanced version of love so people didn't feel so alone.
"Valentine's Day is the ultimate performative moment of romantic B.S shoved down your throats and very triggering for single people and those in unhappy relationships.
"I wanted to blow that up and say this is the other story, don't believe the hype."
Philippa hopes by showing the reality of people's love lives make readers feel 'wow it's not just me.'
"It's the underneath stuff that's harder to talk about. It's impossible to know what goes on in other people's private relationships.
"Sometimes even with friends we can't articulate the truth of our relationship for fear of judgement or betraying our partner. I've had the privilege of receiving these candid confessions so I can share that complexity."
Moving the stories onto Instagram Philippa ensured it was a safe place - taking down comments that were shaming or judgmental: "Not because I wanted to censor but because I wanted the truth to surface without anyone self-editing."
The book has chapters on exes, single life, breaking up, and dating, featuring the "full range of emotions, ages, voices and experiences".
"Some are funny, some sad and some incredibly honest," she says.
"It's amazing how many of the stories were similar. We think we are going through something unique but the reality is we are playing out those same archetypal relationship stories."
Whether it's married folks having an affair, or a fiancée whose partner tells them 'I will call you back' then never hears from them again, it's achingly common.
Gen Z. Philippa says, are struggling particularly with a digital dating culture that "enables cowardice and avoidance", and erodes trust.
"We are in this moment where if someone breaks up with you they don't owe you an explanation - but what about basic human decency?" she asks.
"In this addictive age of communication, everyone hates the dating apps with their endless choice and no repercussions - where it's easier to hide and not to have the difficult conversation.
"Sadly people go into dating with that expectation and their guard up - when the very qualities required for a good relationship are good communication, mutual respect and vulnerability."
The billboards can be seen from February 9-22 outside Camden Town Station, Kingsland Bridge and the American Car Wash on Great Eastern Street, Shoreditch as well as sites in Clapham, New Cross, Battersea and London Bridge.
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