Bit of a strange day and would like peoples thoughts

I had the kids the night before, all great, get up this morning and we go out.
Take son to football and going shopping with daughter, 10.00am, wife calls, could I have the kids until 1.30, she has an errand to do, yes no problem, but could I confirm in a hour, as I had work problems, again no problem.

I get a facebook update on my phone from a bar in town showing pics from the night before, there is only one of wife with friends!! no OM!!!

Bit later I call her to say 1.30 is fine, there has been a change of plan, daughter is going skating with friends, so could I take her there, and drop son home as usual, no problem.

Gets the kids sorted, going into home, wife calls, are the kids ok, etc, told her yes, don't worry all sorted.

30 minutes later she calls back, am I ok, I seem down?, told her I was fine, I was going into the gym and call her later if she wanted, she said yes.

Come out of the gym, go home, calls wife, she asked the same question?, told her I was fine, thanks for the call, but all is ok, I feel great, no problems.

She asks about the drinking etc, how I was, told her its not an issue, I don't think about it, I'm very well, and all is good, she said that I seemed happy, I told her I was.

Then she asked about us, she said that I had mentioned a while ago about doing something together and not telling anyone, what did I mean, this was a while ago so I was a little shocked?, I explained that I knew it was over between us and accepted it, but I missed her as a friend, and would maybe like to do something together, meal, etc, just as friends, I don't want anyone else to know, even our kids, so no-one is asking questions about getting back together, its just 2 old mates?
She listened and understood what I meant, she didn't say yes, but didn't say no, so I left it.

She then started to tell me how hard it was for her to split us up, she did it for the right reasons, for me to get help and to protect our kids, but it broke her heart leaving me??
She said that its not what she wanted but she had to do it for all of us.

I listened and thanked her for doing it, I told her that I would always thank her for leaving me,as it took that for me to get my life back, stop drinking and become a better person, it was just sad that it happened and I wished I could have done something earlier.
She said that nothing other than her leaving would have changed me, I agreed and thanked her again.

We spoke a bit more nothing serious and ended the call.

We didn't mention it was our anniversary, but she must have thought I was "down" because of that?, I know I was fine so not sure.

So I text her " for got to mention, happy anniversary", I was surprised when she text back "thanks"

I just wanted her to know I hadn't forgotten, but didn't want to make a fuss of it.

It seems she still has a real interest in me and maybe "us"

She talked more about her feelings and hurt than ever before, I also think that the changes in me have confused her a little, she can see the man she fell in love with again and maybe didn't expect it happening.

In all, its been a good day, and I feel some small steps forward have been made.