Dealing with the reality of separation

[PeteWyo]

I almost caved last night. My sister-in-law and I were texting about something else when she asked if I had told my W that I missed her recently. I told her that I have not and she told me that I should. I told her that as long as the OM was in the picture it wouldn't serve as anything but false hope and that I she knows how I feel already and only wants to make sure my feelings aren't hurt by what she was doing. She sends this back:

"You never know, she could be realizing her mistakes. What will it hurt if you try besides your pride?"

I explained to her that our conversations have been solely through text and always about bills or her things and that I was just taking this time to get myself right and if my W wants to work on things she knows where I am but I am not going to open myself up to that kind of hurt again and false hope. She told me that I needed to text her today when I knew she wasn't around OM and tell her that I miss her because she probably thinks that my heart has moved on and that women think opposite of guys and that she needs to hear that from me because I haven't said that in a while. I responded, "neither has she."

So I admit I was a little taken aback by this. I know that my W and her sister have been talking more recently and that the W asks how I am doing. So I almost caved because I was telling myself that W told sister she was realizing she made a mistake and that I had already moved on. I do want her to know that I miss her very much but I realize that is against what I am trying to do here. Is there anything that I can say to her to remain strong and still tell her that I miss her. I mean this would require me initiating contact with her. Last night I got a cold text from her saying that "The storage unit is empty, thanks again." I need her to know that I miss her but I don't want to undo any progress that I have made and fill myself with false hope again. Any thoughts? Sorry I tried to get the whole conversation down here but it might not make as much sense when you read it...