So, you just gotta keep things interesting and varied within your relationship.
Not saying you should do this necessarily, but my husband and I see other people, but only together. We do threesomes and foursomes, sometimes with a woman/women or with a man. He’s not been intimate with any of the guys (until last time) but still has lots of fun during those dates and I’ve found I really enjoy women. We have stability and variability at the same time and it’s been a lot of fun. Takes a bit of adjusting after 20+ years of monogamy (for us) but now we’re quite pleased with the state of things.