No, a separation agreement is not a divorce. It does not mean any chance of R is over and done - even divorce does not necessarily mean that. Your MR as it was, was already over and done. As Davide says, focus on what lays in front of you. It is still important to strive towards being the best ballast you can be and to be the best dad you can be for your D.
I know how easy it is to slip into a down state of being. I have been struggling with getting out of the funk I am currently in for 3 weeks. It is hard to see how right now, but I believe that things will get better. I know they can for you, too.
Your pain is valid. Your sadness is valid. Do not fight those feelings. Most importantly though, do not give up on yourself. You do not know what the future ultimately holds, but you can prepare yourself to be ready for however it turns out. Find your resolve and hold on to it!
M: 40 W: 37 T: 20 MR: 13 S13, S9, S4 BD: 1/29/18 Sep: 4/23/18 (I moved out) 8/24/18 I come home, she moves out
If you want to get out of the hole, drop the shovel.