Here is what helped me over the marriage breakup, we had been part of the same group and lifestyle. These things are so individual I wouldn't dream of saying this works for everyone. It is what worked for me.
1. Spend lots of time exercising that beautiful dog.
2. Throw yourself into your job for awhile, and accumulate as much money as you can. This is not a permanent way of life, cause it is not healthy longterm, but it is a good short term way to more independence. Don't stint on taking the dog out though.
3. Thank the fates or deity or whatever you believe in that he is being relatively kind and mature about all this. Make this your mantra "he is not a psycho stalker". This breakup could have ended much worse. If you have a bit of a morbid streak, read a couple Ann Rule books.
4. Don't see him. Not for coffee or anything else. If you must meet to discuss business, bring a friend. And if you see him by yourself anyway, bring contraception.

Be strong. You will feel better after awhile.