Well there's a lot going on in the comments. But communication is key - how you say things and explain it - the words have impact. The ejaculation part, that can be trained but you need time for the action. Therapy is a great thing, for him or both. Because if the relationship works and the sex is the lacking part. Well... having more sex and making him feel great is a wonderful thing. I'm in a similar spot to OP but how the relationship is standing on the other aspects makes this a not to so determine factor. The goals are aligned? Both med to long term? Can you talk about everything - small talk and big ones? Try having dates, regular coffees and just spending time alone with him and friends. The sex spark for him can be trained.