How to know if it’s time to separate ?

Okay so me and my guy have been together for four years and it just doesn’t feel the same. He’s not a bad guy and there’s no abuse going on but there’s just no spark anymore. I find myself not really attracted to him in a more than friend way anymore and have a guy feeling that we’d be better with other people. I feel like shit because we have two kids and I feel like I need to stay because of them. I just feel that we aren’t connected anymore and maybe even a break would help us understand if we still want to be together. I need advice am not sure if this is the right decision. Been feeling like this for a while now..