Partners low sex drive.. help

I need to get it off of my chest. Has anyone else gone through a time with their partner where the sex drive for them is just extremely low or they just have a low sex drive in general? I think I have a very high sex drive and it makes me feel bad when I try to initiate sex and get turned down or it ends up not happening because it feels like rejection to me which is hard to deal with. There has been times when we do have sex but he simply cannot finish. I have also brought up having sex more often because it makes me feel disconnected and he agrees but it's happening again. I need at least twice or three times a week, he could go 2-3 weeks without having sex. If you have been in this situation, how do you make yourself feel better? He said he just physically can't get in the mood as often as I can. I’m not always in the mood but if he touches me, I will get in the mood, why can’t he? He says he is attracted to me but this situation makes me overthink so much. This was not a problem at the beginning of our relationship. He even said his sex life in a relationship meant a lot so that comment stuck with me. We get along very well and connect in other ways, I love him and he loves me so leaving is not an option I just really don’t know what to do, we’re both 26 so we’re young… this only makes me overthink again on what’s gonna happen when he’s older or have kids, it’s basically gonna be non existent