Marriage Proposal to a married woman

My question slightly varies, in terms of reasons of our separation and a new proposal in the picture. We separated 6 yrs ago, to give him time to improve his financial circumstances, no intimacy for 6 yrs and my love and respect for him gone down the drain because no progress at his end whatsoever in these 6 yrs. Meanwhile I have received a marriage proposal from someone who seems willing to take on the family's responsibility with a true heart, mother's istikhara was positive. So was that proposal haram because of the timing as I am in a nikah although separated with no hope of reunion at all. Personally I was of the opinion that I would not apply for a khula until a suitable new proposal is in place and ok to go ahead. This was purely to give my husband the time he keeps asking for. Seems I was wrong in thinking that. Simply put my question is "is it wrong to send a marriage proposal to a married woman based on the condition her marriage has irretrievably broken down ?" If so how would women living in such difficult circumstances of separation or husbands disappearing for long periods of time ever come out of it?