I really dont want to give you false hope but when i first read your summary of the email and then reread it just now, personally I saw the opposite conclusion to you
rather than 'Ive decided we're done' i read more 'i'm resigned to us being done because i dont see the way back'
the second of these is where there is the possibility of a chink of light, like a trepidatious 'please tell me its not all over' but there isnt a way to know for definite right now and i certainly wouldnt act on that basis.
Even if it were an unequivocal its all over, what would you do differently today/tomorrow? havent you already had that message at somepoint since or on BD and yet you have opted a different acceptance of that message.
it certainly a conundrum of what to do but i think sending a holding message is good. you also need to work out what you really want.
Both mid 30s, 2 young kids BD 7sep14 XW moved on long ago, now living with OM1 D paperwork in progress