Have your partner support you when it doesn't work just like they would have supported you if it had. Go to them for support. Don't turn away from them, shun them or make comments about how your love life sucks: they're still part of it so that would be pretty insulting.
I've been rejected while in a relationship, and I've had a relationship end while in a relationship. In both cases, I got my support from friends but mostly from existing/remaining partner(s). Whenever something hard hits you, a partner is the best person to go to
I don't find it irreconcilable at all. Quite the opposite, I find it a source of comfort. It's like one parent dying and you have the other left, you can share the grief and it helps, you know? No conflict here for me.