Marriage blues

My husband and I will be married for a year on the 23rd and together for five years total. Before him I dated a guy for four years and when I broke up with him I started dating my now husband immediately after. Lately I've been wishing I had enjoyed the single life before jumping into another serious relationship or kept my options open. I've also been thinking about another guy lately who I met through my husband and am attracted to. I would never cheat on my husband and I love him but I feel like my feelings for him are changing and not in a good way.  Is it wrong to be feeling this way or having these thoughts? Am I alone on this have any of you ladies been in a similar situation?