It's Weird How It Can Turn Me On

Hi everyone my wife is a gorgeous thick short women packed with sexual pleasure, boobs, legs, feet toes, pussy and the most gorgeous ass I've seen around our area! We have some real kinky talks but she confessed something to me that really shocked me, she admitted to having flashbacks about her ex bf and his cock, she admitted that she had images go through her naughty little mind while I was having sex with her banging her and me enjoying myself on her sex body while she's been thinking about his cock what does this mean? I've never experienced this so I don't want to fuck it up any ideas?