I don't think so. I think there are a lot of people that prefer to engage with many different people, albeit to a lesser extent that a close friendship. I think this is almost an "extrovert-like" mentality. I think as long as there is equity when it comes to leaning on each other in your actual relationships, there won't be any risk to ruining the relationship. Also being honest about your concerns to your SO would be ideal (though I don't know your situation, so not trying to push advice as much as state my personal opinion).

I'm kind of in a similar place myself, in which I'm just really jaded with a lot of the relationships I have and they seem like a lot of work for not much fulfillment. I've taken to joining a bunch of clubs/meetups in my town... I will hopefully see if this does indeed subdue to the feeling of loneliness I've had.