I know there is no way you are going to turn down any of these invitations just from your past experiences. Honestly I'm not sure I would either, but you need to not say a word about your thoughts on a relationship or what would have to be done to reconcile. Your solid answer should be are you done with OW? When was the last time you had contact? If she can not say she is done and has been then you need to tell her that is going to have to had happen before you can even think about anything as you have been drug down that road before and now you are living your life for you and not for what was.
Yes this will be hard. But do not fall down those same roads as before. Go meet. Have a good time. Really. Be fun. Maybe even tell her honestly that you don't want to talk about R at all.
I know you said you have no expectations then you wrote you think they are done and she wants to reconcile.
Let that go
Best of luck.
M 37 W 34
T 12 M 8 D 7 S 4
Need break 4/12/15 W no ring 7/7/15
Separate room 4/12/15 Separate living suggested 8/15 W moved out 11/1/15