I would slow down when it comes to any big decisions as you guys have just recently separated. You don't need to decide anything at this point in time, just take care of yourself and your child and coparent with your H. The big stuff can wait for a Little while.
I can understand how you must feel if this has gone on for a while and ultimately whether you choose to file at some point is up to you. I didn't, but then my situation went south only over the course of a year or so - the ten years prior to that were good.
Also, try not to worry about a potential future relationship - that's a ways down the road. I used to find myself panicking about X and Y - holidays, Xmas - and I kept coming back to - just think about this week - no further ahead. I'll deal with further ahead when I get there..
Blu's thread is a useful one in terms of what may happen after DBing. She and her H are back together again, and she says she wished she had DB'd better and done more for herself. She is insightful and you may find that a useful read too.
Xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus