How to talk to him?

My husband is a wonderful man. He is hardworking and loyal. He provides for our family so that I can stay home with our toddler and I appreciate that more than I can say. The problem is that I feel like he is depressed and is reluctant to talk to me about it. When I try to open up to him about how I feel lonely and unappreciated sometimes, he takes it as a personal attack. I am definitely not trying to attack him...I just want him to understand where I am coming from. How can I approach him in a way that will be less likely to antagonize him? I am legitimately worried about how this is hurting our relationship...I want us to be a team, working together...not resenting each other. I feel like he is trying to hold onto his pre-baby freedom and it is making him resent our son and me even though he wanted to have a baby. I feel like I look forward to seeing him all day and when he comes home in a crappy mood, I absorb the negativity and end up being cranky with him. I love him so much and want to fix things. Please help!