Is this wrong

Is it wrong to talk to an old friend, throughout high school I had a friend Peter. Peter just so happened to be the person I lost my virginity to, no it wasn’t anything like we liked each other. For me it was a impulsive decision and figured it’s with a friend so it won’t be weird because I hadn’t ever had a serious relationship. It wasn’t weird and we remained friends. It’s been a couple of years since we’ve talked, we’ve both had kids. I’m in a relationship, and he is newly single. He added me on Snapchat, and somehow our conversations even tho they may be short lead onto the next day. It is nice to talk to him, we don’t talk anything flirty in fact we talk about our kids and work. Is this wrong? I feel guilty but not sure if it’s for a reason.