Hear, hear married
A man you love, and is your best friend, is kind, thoughtful, faithful and 100% beside you is worth his weight in gold. The grass isn't greener, it's just different.
Relationships are hard, especially with young DC. I have had times, when I thought I no longer fancied my DH, and also times when I have maybe not loved him so much, and I'm sure he'd say the same about me, but as our DC have got a little older, now 7,5,2, things have got easier.
Maybe we've given each other a bit of a break too, and have recently even if we can't get a sitter, had a night when we spend the time after bedtime, just being together, cooking a meal, not watching TV, just chatting, sometimes a shared bath, just trying to reconnect. It works. Our relationship isn't perfect, but it's great. I love DH more than ever, and he constantly tells me the same, and suddenly, we fancy each other all over again. life's good again.
Try and get some help with the depression. Talk to your DH. Give each other time and space. Hopefully you'll come out the other side of this, and be even more solid as a result. Good luck :)