Is This Really It?

I have been in a relationship since I was 13 years old and now I am 31 years old and found that my love of my life, the most beautiful person inside and out was cheating on me. Furthermore, he responded by saying he just did not love me anymore.  I do not believe him when he says he does not love me but has not shown any signs that he cares, but I just cannot get it through my head that it is actually over and that he does not care. I ask him every chance I get if he is over me and he responds yes pretty much every time but on a few occasions he says that he thinks about me sometimes. I am still such a romantic and can't get it through my head that people just fall out of love.