Only a few days beforeSusan Smith drowned her two young sons, her former boyfriend testified today, he wrote her that the children were one reason their relationship could not continue. Tom Findlay, who was 27 at the time of the boys' deaths and who had an affair with her while she was separated from her husband, said in the letter: "There is something about you that is not suited for me, and yes, I'm talking about your children." Smith, who had mentioned pressure fomr a boyfriend but had never named Findlay, has written in her confession: "I was in love with someone very much, but he didn't love me and never would. I had a very difficult time accepting that. But I had hurt him very much, and I could see why he could never love me."