Am I actually happy?

Me and my finance have been together for 6 years. We have always been okay. Some big arguments here and there. Some small. We got engaged 2 years ago. Neither of us is really planning the wedding. Honestly I am in no rush. It gives me time to think if I really want this. I know I am comfortable in this relationship. It just never gets better. We stay afloat. We get along okay. I'm a stay at home mom. He buys everything I need which is nice. But that's about it. He doesn't help around the house. He is not affectionate anymore. I go through this phase a couple times a year where I think to myself "is this really what I want?" I hate the thought of him being with anyone else. But I also hate the thought of staying in this limbo of a relationship. It's okay but I feel like I can be with someone I can feel happier with. We have both changed over the years. I love the hell out of him but maybe we just aren't good for each other?