Mummy - sorry but nothing said indicates you recognise the difference between criminal and civil case.
Criminal and civil cases are entirely different and one isn't dependent on how busy the other system is. There's either enough evidence for a criminal case or there isn't - that's what tips whether there is a criminal case.
Plumtree - can't even begin to imagine what you mean by "why doesn't he sue her back". You only sue in a civil case if there's a chance of the other side having enough money to pay any damages awarded by the Judge. Also, you expect the person or entity you're suing to be able to pay your costs when they lose. Costs are huge. Some people that lose such cases are bankrupted. Headlines: "Andrew goes all out to try to bankrupt somone" - would not be great PR or legal advice.
Criminal case - the state legal system is paying.
Andrew is a repulsive character and currently this thread is talking about him as the accused in a civil case; he is worth suing as he has money to pay damages and costs. He may decide to offer an out of court settlement to avoid court (I think it would be bad legal advice to do that though) as no criminal case has yet been brought.
You don't sue someone with no money as they won't be able to pay any damages awarded and they won't be able to pay costs incurred on both sides. No-one is arrested and no custodial sentence is delivered from a civil case. He is the accused in a civil case currently.