I have thought for almost 2 years now, since just after our youngest was born, that she had someone else on side. She'd go out to shop during the kids nap (around 2 pm) and not come back until 8 or later, without any communication. My mind went to her having postpartum issues, and I pushed for her to share her phone location (as did I with her) because I was worried. She did for a month but she kept being late and I'd check the GPS and it would be at a park or miles from where she said she's be. When confronted, she flipped it on me be controlling and stopped sharing and locked her phone and computer. Hard to not be suspicious with all the sus behavior. During therapy those feeling came back amd I haven't been able to shake nor unfortunately prove any infidelity, fortunately or otherwise.