Husband still searching for sex

Tiffany • About to get divorced with two children and prego with baby #3 eta 6/17/15
My husband just came back home for the 4th time. Yesterday was our 1 yr anniversary but our marriage has only been happy for the first 4 months. Once we got pregnant stuff turned bad to worse to hell! Now he has come back after me trying to work out our problems but what do you do when you have no trust yet, still snoop and find out that he is still on Craigslist looking for casual sex with prostetutes and etc. when is enough enough mind you im 2 weeks and 3 days away from giving birth to our third child. I'm under so much stress but now I'm at the point of idgaf about this marriage no more. I have been trying and busting my hump to believe in us but it's just me trying. My husband has expressed that he's not attracted to me, not in love with me but is here for me. Should I let this marriage go? I love him but I can't take no more and I'm tapped out! Help me please!