Help with teenager

My son turned 16 yesterday. I love my son very much, but he can be incredibly difficult and just plain spoiled sometimes. At times he can be incredibly sweet. Ok, on with my post. His birthday was yesterday, I am divorced from his father and his father has a live in girlfriend and we all get along great. I even have a key to their house so I can let the dogs out. Anyway, I got my son a lot of his presents early ordering things and shopping trips. I told him this was a birthday present. Well he was reaching his limit and I told him he wouldn't have anything to open on his birthday because I have spent enough money on him. I'm going to add that he's into anything basketball related and expensive as hell.I didn't order two jerseys he wanted. I got him two gifts to open and a hundred dollars in his card. He opened them and asked me a few minutes later if I had ordered the jerseys and I told him no he can order it with his birthday money. We sang him happy birthday very uncomfortably, and he stomped to his room. His dad had about six gifts for him to open and he wouldn't com out of his room. I didn't get upset and cry this time because I knew somehow every thing I did wouldn't be good enough. He was already mad we wouldn't get him a corgi puppy when they have 4 dogs now, 2 Dalmations and 2 schnauzers.I'll give a little background, his father and I have been divorced for 4 years. We get along great now that we're divorced and I have a good relationship with his girlfriend. This behavior isn't new from my son, but has gotten worse since becoming a teenager. He told me about a year ago he was having dark thoughts about hurting himself, his school had also called us last May to tell us some students overheard him saying he didn't want to live anymore. He's been in therapy for about a year. He had a major meltdown before Christmas one night and my 12 year old son FaceTimed me and told me to come over. He was threatening to hurt himself. By the time I got there, things had calmed down, it stemmed from a fight with his little brother. My 12 year old came home with me because he was to scared to sleep there that night. I'm not sure where I'm going with this post and I apologize for it being all over the place, I guess some support and feedback from other parents of teenagers would be nice. Thanks via /r/Parenting http://ift.tt/2IHpkqi