My Wifes flirty behavior?

after being married for 10 years to a gorgeous spanish girl , i feel insecure because she is always checking out handsome black and mixed race guys out , sometimes her eyes linger long enough so that a smile is returned to her in my prescence , this makes me feel insufficient as iam considered quite good looking and fair , i was my wifes first bf at 21 , so iam thinking that she may have just gone for me because I was relatively attractive to her but not her desire , and this seems to show now never in 10 years has she ever looked at anyone who remotely looks like me. She is so not interested in the bedroom past 12 months , when i quiz her she says that marriages move on and you become more like best mates , which is true but I want a lover as well!! I know she will never leave me because she always said that marriage to her was all about the friendship which we have in abundance , and for her she feels complete , but to me it seems like she is not that attracted to me but happy but this seems an alien concept to me as my wife is my friend and I fancy the **** of her , when I confront her about looking somedays she will say to me well don't you appreciate the beauty and when I say well some of these guys are smiling back at you and she says so what , iam a friendly person who will smile at anyone , then she will acknowledge that these guys are good looking. Then when iamupset about it like I thought you were attracted to me in a big way when we first met , yet she has then said things over the past ten years like i thought you had a big head when we first met and short legs!! So when I confront with all the aforementioned together she then swears on her mothers life none of it is true even though she has said it , so she leave me confused. Do woman love men just for personality alone if so its a compliment to me but it does also make feel insecure that she isnt finding me as attractive as black guys on the street?