I have done but with husbands knowledge, it weren't nothing like sweet reminiscing lol or anything just to see how i were and to congratulate us on our marriage and stuff, but that were it, no out of hours texts etc, i wouldnt do that as i wouldnt expect it done to me, but he has spoken with his ex also, and we tell each other if and when or when crops up
but i suppose it depends on circumastance also, history or whatever as no history is the same.