Going soft after pre cum

Wife was gone for three days. After she came back I expected crazy sex. She was acting different . I went limp after I pre cummed while I was going down on here which has never happened . Also I recently confessed to her that I make out with her cousin 12 years ago . Things are awkward now in the bed room . I have gone limp twice now during foreplay . I am definitely in my head. Any advice would be greatly appreciated.