I feel for you Jess, I hope a vet can give you some advice on how to handle him coming and going. My H told me 2/14 he wanted a D, went back to work overseas, had a "family" vacation 7/14, injured at work and home 10/14, in separate rooms since. It is difficult being in limbo but you do have some control over it (as do I), it just depends on what you want.
My only advice is to not bring up R talk at all, (with the exception of if you decide to tell him to not come home until he figures it out). Take care of yourself, look and smell good when he is around, be positive and get a life of your own (easier said then done with 2 small kids but 25 would disagree! :)).
If you feel you need to set a boundary about him coming home than review the boundary cheat sheet Wonka posted. Just like with kids, make sure you follow through with your decision and the consequences you set forth. If you are unsure of what you want to do, don't do anything yet.
BTW...although your friends probably have your best interest in mind and don't like to see you hurt, you have to do what is best for you. If they can't support YOUR decisions than I would choose not to discuss your R with them at this point. Just my opinion.
Hang in there, this DB thing is a tough road!
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Me-44 (45) H- 50 (51) M-'96
S-18(20)D-15(17)D-12(14)
BD Feb 2014 (he works overseas) home Oct(sep rooms) (EAs possible Pa's unconfirmed) insists wants D through July 2015 no more talk of D since