It appears the feelings your wife has for you are still intact. Maybe things are not going well between her and the other guy. Another possibility is that she's feeling guilty. The last possibility is that she still loves you - has feelings for you.
Her playing 'getying back together' songs is an indication she wants to come back to you. It's a positive indication the marriage won't disintegrate.
I hope you will take the sign positively. In a matter of days, she will ask for forgiveness or for reconciliation.
Best of luck and I hope the two of you get back together.