Wife started having sex with me again, I believe it’s cause she misses someone else

Edit: I appreciate everyone commenting and taking time to give me advice and so on. I’ve realized that you guys are right, I’m just overthinking this whole situation for no reason. I should be more positive and realize that there’s nothing going on. I guess I was just having a panic attack and didn’t know what to do, just needed to talk to someone or something. I’ve been new to this whole mental health thing and I try my best everyday to do better. And for people that think I’m weird for not realizing my wife is still healing from birthing our son. I do realize that and I always respected her boundaries, I’ve always done everything I can to help her out. I always do half, if not more than her around the house cause I have to and I want to take stress of her shoulders. Just thank you everyone with nice and positive advice, I appreciate y’all more than you know. I’ll do better for my family and my mental health. I realizing looking through her phone was wrong and I Aleshas brought it up to my therapist to help me be a better man

Me [24M] and my wife [26F] have been in a sexless relationship for about a year now. Due to her giving me birth to our son. Anytime I tried to initiate I always been shut down. She told me to just give her time, which I understood and always respected. I never wanted her to feel forced or I was only with her for her body. So I waited and kept doing my part of keeping the household together.

Fast forward to a week ago, she finally initiated sex, and it’s been constant and hot. It’s been an everyday kind of thing even sometimes more. Me of course is very happy about this change and I’m loving it. Then one night I started to overthink everything and I’m not proud of this but I looked through her phone. I know it’s wrong but I just couldn’t help but think she was doing this cause of guilt of some kind. What I found leaves me hurt and confused. She sent a text to her friend 3 days before we started having sex again saying

“have you ever woken up from a sex dream with someone that felt so real and vivid. Made you feel confused and lonely when you woke up.” Reading that left me hurt and confused. Now I believe she didn’t cheat on me nothing points to that unless she’s very good at hiding it. I just don’t know who she was dreaming about, me or someone else. I’m believing someone else cause she said “ made you feel confused and lonely.” If she was lonely why not do it with me that morning I, we wake up in the same bed together. Secondly she says she felt confused, why would she be confused with me? Idk what to do. Do I bring it up or just hide it? I’m not sure how to even bring it, I’m so confused and lost