Name, if you're saying what I think you're saying (the sex under coercion bit) then please please tell the police. That is rape, he can be dealt with for that. I'm not saying it would necessarily end up going to court, these things are always extremely difficult,one word against the other, lack of forensic evidence etc, but that is something to worry about later down the line.
For now, if he were arrested, then he could be given bail conditions not to come to the address, not to contact you etc. If he broke these he would be arrested for breaching his bail. Again, I know what I'm talking about as I am a police officer.
You have lots of evidence you can give the police of ongoing emotional evidence - obviously some of it will simply be verbal evidence, you recounting incidents that have happened (that list that a poster made you a couple of pages back would be really helpful). However, there is also the text messages/emails he has sent you since you split up - you can show that you have asked him to leave you alone and he has consistently hounded you until you have had to give in because it was too much to cope with.
Did he make the suicide threats/threats to walk out of his job by text or email? Great if he did, more evidence to show the police.
There isn't just the sex aspect, there is the spitting - again, this is assault. Potentially, there is also harassment, as previously mentioned with the texts/emails etc.
The police should be on your side, and if you get an officer that doesn't seem that interested (I hope you don't, but unfortunately, there are some that give all the rest of us a bad name) then ask to see a different one, ask to see a specialist domestic abuse officer, or even ask for a sergeant. To be honest, him getting arrested would definitely be a positive as bail conditions would really help you, and not only that, would also assist towards getting a non-mol.