My boyfriend says he is dumping me

Wow....with emphasis on 'ow'. I feel like a white hot dagger is twisting in my heart. I have been the best thing that ever happened to him. When we met, 4 years ago he was living on 1,200 a month from the VA. He was wounded in Afghanistan and was retired at age 30 (8 years ago). I helped him increase his VA disability pay to 100%. Something he could not do himself. He received a total of 50,000 in back pay and now lives on 4,000 a month. We have been a great couple for each other. Suddenly, he says he wants his own place and is moving out tomorrow. The saddest part for me is our dog who adores him. He is moving to a place that does'nt allow pets. It is insane. It all started when his 16 year old son left, in july. We had him with us for a year to see how things went and we returned the ungrateful little brat to his mother in Fl. When he left, my boyfriend started acting mean and buying stuff like crazy. Huge plastic spaceship model, 400$ movie replica Thor Hammer. Stupid plastic crap. He started being really mean to me. I contacted his VA psychiatrist and asked that he be tested for bi-polar disorder. They give him drugs but he doesn't take them. MAN!!!!!! I am sad.