@Aarthi balaji,
You can love more than one person in your life. You can be best friends with more than one person. You love your Mum, you love your Dad.
Your Husband is very lovable to you, he has been consistent with you always stating he had a crush. He was a young man, he learnt how to express and now from that learning he is expressing more, with his wife.
He did not lie to you, you assume.. Even in a crush you talk intimately.
You need to let go of this now, or you will ruin your marriage.. I am sure you had crushes and talked in your sleep intimately to that crush.