Praying for you. Going through a similar situation with my husband. Hang in there, God believes in marriage and he will help you.

Think of how much the Father loves you in giving His only son Jesus to die for you and receive that love for yourself and meditate on that and then after you will be able to give that same love out towards your wife.
The enemy may be trying to take advantage so head him off by lavishing upon your wife unconditional love and attention without looking for anything back because you know that God is in your corner and loves you unconditionally too. Receive the love that you need from the Father today, and as a suggestion take your wife out for a dinner or get her some flowers or do something you know she would enjoy. Have you heard of the book called The Five Love Languages? It may be good to read for everyone recieves love in different ways. It will give you some helpful advice inorder to help strengthen your marriage!
I will pray for you also.