When to call it quits

So my husband and I have two small children. They are very close in age 15 months and it’s put a HUGE impact on our relationship. We devote every single bit of our time to them and never go out. I talked to my husband recently suggesting going out one night and just do something for us. He isn’t down for it we don’t even sleep in the same bed since kids. I just feel like I see myself pushing away. I don’t feel close anymore and I have tried to talk to him about this multiple times. He puts no effort in with me. I am a stay at home mom and I just dont know what I will do if things don’t work out. I did have a really successful job before I didn’t go back after my second child. Like I know this seems harsh but is it normal to go to bed alone I am only 27 and I don’t feel very close to him at all.