heartbroken and feeling stupid

Hi, I'm 53 and I've been separated for years.  After a horrible separation of an abusive husband I finally had the courage to start dating after 15 years of raising my girls on my own.  

Long story short.....we were together for 11 months.  We agreed to always be honest with each other.  He was on his own for the last 2 years after another painful divorce (3rd time for him).  

When we met....we hit it off right away. He admitted that he was a little 'messed' and didn't want his family to know because he's a cop and should be stable.

Approx a week before Valentines Day I asked him if he wanted to get together to curl up to a movie. He replied 2 days later stating no and that he was sorry but he said 'love = pain' and he wants nothing to do with love.  That was the last time I heard from him in a positive way.

He disappeared and within 1 week he was with a new girlfriend. They've posted pictures together online stating their relationship. I'm left trying to pick up the pieces and attempt to understand why??  I'm hurt and confused.  I'm not mad or angry....I just don't understand why he was with me for so long if he didn't care.   

Any help would be apprciated!