Just need to vent..

Okay, is marriage supposed to be like this hard with two under two ? I feel like such a huge disconnect from my husband, and this was before my last baby was born... We’ve been married for 3 years but together for about 6. And I’m worried we are growing apart rather than together. I am a stay at home Momma, and he is always working, and I know it’s to support us. I just feel like when he is off he’s so exhausted, the kids stress him out, and I’m not going to lie, I nag. Am I being selfish ? Is it like totally wrong for me to be feeling this way? And I’ve been thinking about an ex for some gosh dang reason and have absolutely no reason why I should be :/ really just hoping this is a stressful time in our lives and will get better as they get older, because I’m worried that we won’t make it .