Watching porn

I’m 28 weeks pregnant and I found out today my fiancé has been watching porn at work. And basically lied to me by hiding it. I have asked him multiple times to not do it because it makes me feel like crap. And then I find it today. We have been doing amazing the last 2 months no fighting nothing. And yet this happens and I feel like I just lost all respect and trust I built for him got lost. I basically over this crap. I’m legit just wanna be done here I have done nothing to deserve this. I have loved and taken care of him and been there for him and this is what I get.