14 year old says he does not love me

My son has always had issues since he was a toddler. He would refuse to show anyone any affection. He wanted to always be alone and would have anger outbursts. Now he's 14 and gets into fights at school and likes to start fires. My husband was always for discipline in spanking. I'm not a fair of spanking but my husband spanked him and the behavior never changed. He recently told me he doesn't love me. I told him he was just upset but he says he is not. He feels no love for me or his dad. He recently saw a psychologist and they diagnosed him with reactive attachment disorder. He pretty much failed to bond with us as a baby/small child. He told us it's treatable with the right therapy and it best to get started soon. He described it as my son may desire love but is afraid of disappointment so he chooses to not give it and without treatment this will affect his life worse as he grows up especially with his behavior. I can't think of what we did wrong. My husband is very against therapy and says that talking about things isn't gonna make her son magically love us and we shouldn't waste our time. He thinks we should make our son get a job or something. Put him to labor which will keep him busy and out of trouble. I don't know how that will help him mentally though. I want to at least try therapy but my husband is against it.