H4L I'd definitely be making my own birthday plans rather than get my hopes dashed, mine was over Xmas so H was around, its a hard time to have a birthday as it always falls on the bit when restaurants close as light relief between xmas day and new years eve so guess what I get to nothing usually.. I agreed to spend Xmas with H but said in no certain terms if he wasnt going to spend my birthday or new year with me I'd like to know so I could plan my own celebrations, funny that he then behaved like I'd left him out and organised something lol!
Personally I'd organise something that he could drop by too, but if he didnt the end of the world wouldnt come, so several friends out for dinner, or a bit of a soiree at your place after S has gone to bed maybe! But in your mind see him as not coming at all your birthday after all is for YOU!
H does seem to be doing some work on himself which is good news, dont forget to validate his hard work as well, I do think the time apart you are having is working for you both so use it and treasure it as if/when you are together full time its gonna be a hellava lot harder.
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W 47 H 47 M 24 T 30
Once lost but now found and happily married again!