Really need advice.

Hi ladies,
I'm 28+2 and I'm facing such a huge dilemma, I don't love my partner anymore. We have been together for almost 2 years, we had a short break which I thought was the end, stupidly met up drunk and that's when I got pregnant, because of the pregnancy and of course love for each other we got back together, but now I am so unhappy, we have been living together for almost 5 months and over the last 3 months I have felt myself slipping into a depression because I am so unhappy. I don't know what to do, he's not perfect we have lots of fights and he's constantly putting stress on me in this pregnancy. I find myself looking at other men longing for something more than what we have, or longing for what we used to have.
Moving home isn't an option, so I feel forced to stay for the well being of my baby. Please tell me or advise me on what to do. I am so lost, the only thing keeping me going is this little life I'm carrying.
I feel so lost and upset. I just don't know what to do.