Yes... it is possible this is the main reason.
Have you been to see a therapist to help you work through your wounds?

P.S.
I remember a time after my daughter had passed away and I had a mental breakdown that lead to me attempting suicide, not once but two times, and my husband still coping with the loss of our daughter did the only thing he could to survive at the moment - he pulled away from me emotionally out of the fear of loosing me... mentally he could not handle hurting all over again.