That's the danger of Facebook and some sites, people can find people who may not want to be found. Always be "internet cautious" with any personal information, no matter what site you are on.
Can you trust him? Why would you think you could or should? His actions belie his words. Does it matter anymore, anyway?
I agree with the poster above...close this chapter and don't look back, there is nothing good there for you.
Hugs