a different perspective... I was a lot like that in my teen years. My biological father bowed out of my life when I was born but came back when I was 11 only for one summer before disappearing again among a few other things in my childhood.
By the time I was thirteen I was unquestioningly suffering from depression and suicidal. In my own opinion, I think I had been suffering for years before, but that was the year I was suicidal.. 13 and after my 14th birthday. I was no longer suicidal a bit after starting freshman year, but I was still very much so depressed and suffering from a lot of anxiety.
I was absolutely horrid. My mom married my stepdad when I was 14/15 and it was a huge struggle for me. I was already dealing a great deal with dad and father figure issues from my past but then this guy I didn't know at all started becoming part of our lives. My mom's relationship with him moved a GREAT DEAL more quickly than mine did and before I was even ready for him to spend nights, he was moving in (he had been spending nights prior to that) and they were getting married when I was just getting used to another adult living in the house. My mom had always told my brother and I growing up that should she ever be in a relationship, we would get a say in how quickly they become that big in our lives because of the alluded past issues and that she would never take his name anyway because she wanted the same name as us, her children. However she did take his name. This probably wouldn't have bothered me if not for everything else but it ended up being the straw. I was an absolute UAV to both of them and to many other people. I was told as much actually by my mom. It was true and I knew it was true but that hurt a lot. I was so confused and in such a bad place and I couldn't seem to control my anger or sadness or confusion and just lashed out.
I'm not saying he has these feelings specifically about the two of you together, but it can definitely be hard for a kid to watch a parent be with someone who isn't the other parent.... especially when the other parent doesn't appear to want the kid. its already a confusing time with puberty and growing and changing and figuring out more complex emotions without feeling like you don't belong or have been abandoned or aren't wanted.
It might help to be gentle with him and see if you can find the root of the problem. Its okay that he doesn't like your husband although he DOES need to respect him... but I think that you and your husband also need to respect his feelings with his own dad and how his parental unit is currently. Maybe he needs some one on one time with you specifically to feel like you aren't going to leave him like his dad apparently has for this new family you are creating. Even if he hasn't thought those exact words and even if YOU know thats pretty ridiculous... it can still be a confused and horrible feeling he mgiht have.
I could be way off base.. but he is clearly angry and I remember being exactly like that. I wanted so badly to hate my stepdad and I wanted so badly for my mom to leave him so we could go back to how we were... just us. Where she had more time for us because there was no one else important in her life. Selfish, yes... but it was what it was. for what it is worth, I really like my step dad now (its hard not to, even then!) and they are currently in counseling and considering separation for awhile to try and avoid divorce which actually makes me sad. Now I DON'T WANT him out of our family
