Husband doesn’t want to have sex with me

Hi, it was been a long time that i am thinking to share my nightmare on your page, and now it took me courage to do so..believing it will ease my pain and gain some advices. I am almost 6 months pregnant with our second baby now, and i have discovered that my partner cheated on me with his first gf since i was pregnant with our first baby. Our first baby was lost , my OB told me that there is no more heart beat after 2 1/2 months, this makes me so devastated, useless and so depressed ,no nights and early morning that i never cry out and even sobbing so deeply... i did not feel that my partner feel so sad or pained same as i was when we lost our baby..after few months later i discover a sex video of my partner, and i was thinking he was the reason why our baby was gone, because he cheated on me..and i can feel that he never felt a guilt... it hurts me so so much, i dont wanna live, i feel double or even triple pain of what happened to me and my baby plus of what he did to me.. i was not fully recover with all my pains, depression and all hurt aches then here comes, seeing the video of my partner having sex with her ex gf... you know what ,while typing this nightmare, i can't help my tears rushing to come out in my eyes, yes i could feel all the pain again no matter he said sorry to me..and no matter he admit that it happen only once, i could hardly believe.. i forgive him, but everytime i close eyes i only saw thier sex video, i try not to cry and divert my sadness to happiness knowng he is still here for us and also not to be sad since i have baby growing in me..but it was so hard... Please give me advices what to do ..please consider that we are not also in good terms with his parents and his brother.. Im very hurt, I am still depressed I know..what bother me most , is I dont want my growing baby be affected in my tummy of my depression,pains and heartaches... PLEASE advice me what to do.. if he will propose will i say yes? if he wont come back what should i do? Thank you for ready my nightmare and for your advices.