The last time I saw my ex was six or eight months before that, when I was single. After a hard run at a party where I was hoping to tell him I wanted to get back together and instead had to make small talk with my plus one, I deleted his number and vowed to move on. I met my new boyfriend and happily entered into a new relationship. But when I saw my ex’s name on my phone, I couldn’t participate in the WhatsApp conversation. I could have felt wrong because – even though I was happy in my new relationship – even seeing his name gave me butterflies and took my breath away. This does not mean that I have to be with him. This does not mean that I was not happy with my current partner. But I knew talking to my ex was going to feel, in short, a lot like cheating.