I wouldn't use the word "afraid." More like apprehensive. I am not interested in a relationship, let alone marriage. I've learned you can't trust anyone. I went out with someone who I thought was a great person. He had tons of friends, close to his family, kind to a fault...or so I thought.

We moved in together and everything changed. He become emotionally abusive, manipulative, invalidating. I would ask him to do things, however minute, and he would whine.

From my experience everyone has a secret or something they're not proud of. How and when it manifests is another issue.