Lonely in a relationship

So I would like some opinions, I've been with my man for eight years, we have two kids together and he's raising my oldest that isn't his. He works hard and I'm able to be a stay at home mom. I love the life we have but honestly I feel lonely. I know he's doing all that he can and I'm proud of him.

When we got together we were on the same level, we didn't like to much affection. We loved our own space and it was perfect. But now I feel like the older I got I've changed, I need more affection. I want more intimacy and he's still the same. I know what I got into when I got with him but I'm not the same anymore. I've talked to him about it and he says that maybe I need more in my life. Hobbies. Friends. I have no friends cause my life revolves around my family. Am I wrong for expecting more from him when I knew what kinda man I had? Do I take his advice? Or how can I make him see that I need more of him to not feel so damn lonely? Cause honestly....... I've considered talking to another guy. Not having anything physical just to get what I'm not getting now.