keepin secrets

so i met this girl at the gym, she’s like 30 and we hit it off super good. we talk about kids and stuff cause shes a teacher, i tell her im a stay-at home parent too but for my kid. we started seeing each other out of our friendship kinda thing and its been great, just havin fun and talkin and yeah. but then one night, we were really into it and stuff happened, u know? like i said to my wife i was keeping this from her cus shes not down with me getting outside the marriage even if its just for a bit of fun. anyway, she told me about her own secret things which is wild. now im feelin kinda good bout us but also scared cuz my kid knows something’s up and its all very confusing. like am i being a bad parent or are people just supposed to do this stuff sometimes? what do u guys think?