Is how I feel justified? Or is this just dumb?

Ok. Short version of the story.

My bf opened his gallery, I saw a still from what I rightfully assumed was a porn video he saved to his phone. He admitted to me that after I told him I deleted my Instagram account he started following cosplay groups/porn stars and came across a photo of a girl advertising that she does porn. So he found a video of her on a site and then downloaded one from pirate bay. He told me he had been watching porn and masterbating 2 to 3 times a week for the past month. He said that I made him feel unwanted and like I wasn't interested in having sex with him, so he needed a release somehow. I get that 100%. However, I was hurt for a few reasons. First and foremost, I just had a baby 4 months ago. My body has changed drastically & I have been really self-conscious & hadn't had much desire to have sex, but we were still intimate just maybe not as often as he would have liked. Sex is hard for me to enjoy when I'm not in the right mindset, especially when I don't feel sexy. I was also hurt because not only did it make me feel even more insecure about myself, but it also made me feel like maybe I was inadequate in bed & that I just wasn't doing it for him anymore. And lastly, I was really bothered that he didn't just tell me how he felt, and instead of giving me the benefit of the doubt and trying to resolve the issue, he took matters into his own hands...pun intended. Furthermore, it really frustrated me after I realized that so many times, while I was busy tending to our son..alone, he would disappear into the bathroom for 20 to 40 minutes, claiming he was pooping, but really he was jerking off to porn.

In some ways, I can admit that I was apart of the problem. And I am working very hard within myself to forgive and move past it but it's hard when you feel so low about yourself. Just wanna know how other women, especially new first time moms and just moms in general, would feel about this. Am I totally insane to have gotten upset by this or am I kind of justified?