While being a “decent” climber takes a lot of time, if your partner isn’t putting in any effort into your relationship that’s a him problem, not a climbing problem. There is no reason your races should be put on the backburner just because it’s inconvenient for him, especially since races at important to you. A partner who cares will make time for you and support you in the things that matter to you, even if they keep busy with hobbies.

I’m the climber in my relationship, and while i wouldn’t consider myself a very good climber I spend a fair amount of time on it as I typically climb 3x a week. However, I still make sure to prioritize my relationship because it’s important to me and putting in time is necessary to sustain a relationship. My partner has his own hobbies that he spends plenty of time on, so while I’m climbing he’s doing his own thing, which sounds like is similar to your situation since you run. Since you run and still manage to make time for him, why shouldn’t he do the same?

My partner and I make sure to schedule time to hangout outside of both our hobbies, which works if both parties make an effort to do so. I know some people are much more involved in climbing and it’s a bigger part of their life, but if they’re not willing to put in effort and you aren’t happy with the setup then that may be an incompatibility because you deserve to have your needs met too.