Please explain 2 me why I feel this way?

I'm casually dating 2 men in their late 40's. I'm 20 something. Please no lectures! Lets call these 2 middle age men A and J. I have known A for nearly 2 years. He is very energetic and talkative like me. I love talking to him. He always talks about his 2 kids who are a teacher and a nurse, his health problems, his neighbors, co workers and everything else. I met both of his kids 2 or 3 times. I don't even care when he talks about his ex-wife whom he is still in contact with. I have known J for nearly 3 years. He hardly talks about anything! Last week I found the report cards of his 2 straight A high school students while he wasn't home. I wonder why he never told me about or showed me the report cards! That is something to brag on and on about. I also found out that he gave his ex wife a 5,000 dollar engagement ring. Suddenly I'm starting 2 hate J, his kids and his ex wife! I'm almost wishing that I never even met the man! I don't even know why I feel this way! I don't hate As kids or ex wife who he is still good friends with. Why?