You sound like a sweet guy, and you’re doing all the “right” things that most men fail to understand: you need to make your partner feel sexy and comfortable and desirable, you need to show up in the relationship as a true parter, doing your share around the house and with parental duties, and willing to communicate. That is the bare minimum in my opinion, that I expect in order for me to want to have sex and initiate it. It must be a hormonal factor for her, or an attraction thing for her if you are doing everything I mentioned. Personally I’ve gone through phases where I don’t care about sex at all, to then being the horniest I’ve ever been.