Pregnant and feeling unstable

My husband recently started watching porn. I told him it was ok in front of me but nowhere else. Now it's all he wants to do is watch porn. He screws me when he's done looking, but I can tell his mind is elsewhere. As if that isnt enough, I am 26 weeks pregnant, and feel more ugly and insecure than ever. Now I don't even feel sexy, or good enough anymore. I am just really done. I wanna just call everything quits. I don't wanna hurt anymore. Maybe I'm over reacting but it hurts that he is across from me looking at porn on the computer, while I am in sexy clothes, posting on here, holding back my tears, yet the occasional ones slip. Why does he want to watch porn? Why am I not good enough? Why can't he see how much it hurts?