My wife just told me that I need to train my dick to be harder.

I am an average guy with an average dick. I've been with my wife for 9 years, and we have 2 kids together. She's everything to me. But after the birth of our second kid, I noticed that she doesn't get into sex as much as she used to. She's not as wet as she was, she's not as excited as she was. Plus, she's not lubricating herself as much. She used to love my foreplay, she used to beg me for more. Now she doesn't even let me kiss her down there. It's weird. She's told me that she finds it gross and she's not in the mood for it.<br><br>We still have sex every other night, but the excitement is gone. We used to be very experimental. We used to do it in weird shapes and positions. I used to make her squirt. She used to squirt in my mouth. I used to finger her anus. We used to have so much fun. I feel like she doesn't even like sex anymore.<br><br>Then she told me today, that I need to train my penis to stay longer and harder. I'm confused. I've always had sex with her for over 30 minutes with no break. I would go for hours without a break. I have no problem with staying hard. I'm also very thick. So this made me wonder. Has she been with another guy? Is that what this is about? Is she trying to tell me that another guy can satisfy her more? What is she trying to tell me? I'm so confused. She also demanded that we use a condom because she doesn't wanna have kids anymore.<br><br>I don't know what to think of this. I feel betrayed. My trust in her is gone. Everytime I see her I can't stop but wonder if she's been cheating on me. I don't know if I should confront her or if I should investigate by myself. I don't know what to fucking do.