Am I delerious or am I letting my mind take controll?

I have been with my finace for over a year and we are to be married in the spring. I knew we were meant for eachother the day we met. Recenlty I feel as if I am not giving her all she needs or wants. I do everythng for her. I feel that she is not romanticly enticed by me anymore. I try to flirt with her and be provocitive with her and get no respnse at all from her. At night its a reareity she wants me to cuddle with her and she no longer cuddles with me. When she bumps into me in the middle of the night she quickly moves away. When i try to cuddle with her she moves over. Even though I have reconized each month anerversary with her she has not. I keep exes out of our relationship ( ive never brought them in because it ended for a reason) although an old guy friend of hers has come back into the picture and i fear that her mind is always on him and not me. I was hurting emotionaly really bad a few days ago and not once did she ask me what was wrong. She had to know beacuse i let it be shown. I have opened up to her and not just in writting to her but I have also told her how much I love her and how special she is and how my life is so great with her in it. She respnds with thank you. She does not open up to me about these things.I know when something is bothering her and I ask what is wrong. And I have always supported her. I want to make her the happiest woman alive but i feel i am failing right now. I can not sleep i toss and turn all night and it makes my mind wonder and right now i wonder if she has grown tired of me. I also found out that shes calls her freind something special she calls me...which now makes it generic when she calls me that..