togoornot - that's pretty much why I left my DP (when DS was six months old). THings were pretty dire when I fell (accidentally, unexpectedly) pg, but we tried during pregnancy to make a go of it. In fact, though, the pregnancy made me realise that I couldn't honestly contemplate the idea of a life with him (we'd been together about six years at this point). Although he was very intelligent, good lucking, interesting and so forth, there were aspects of him that I couldn't deal with: his inability to behave generously towards my family; his dismissiveness of others; plus the fact that, like you, sex was something I could no longer bear the thought of.
I had a half-thought that when DS was born I'd feel differently, but on the night - literally the night - after his birth I knew I had to leave. It was stressful and very painful for both of us, and practically speaking a nightmare for me (house was his, so I moved out to live in Dsis's spare room with DS, at the same time as starting back in my (stressful and demanding) job and settling DS in nursery), but I can say for an absolute fact that we are both, if not happier now (in that we're neither of us doing cartwheels round the garden) we know it was the right decision, and I feel at peace and able to look forward to the future, whatever it might hold. You only have one life: if you're unhappy in your relationship, I think you have the right to start over (and I'm speaking as the child of divorced parents so quite aware of the child's pov) (and I always thought my parents did the right thing too). Phew, hope you got to the end of that! Good luck, whatever you decide