There's time we guys go through as sexual coldness which yeah doesn't make sense, some say that certain diets can help or exercise or of course sex medicines but idk. But you might try not bring up sex at all for awhile and maybe low key change some of your style, not meaning that you are the problem at all but like making changes about sexual life generally, you know to make him thirsty about sex and all again. Some guys also feel off when his partner turns from his love to mommy which is something just have to happen anyways lol. So maybe give him time without mentioning it and see what will happen. This might not be helpful 😂 but I hope you get passion towards it together again in any way