Do nice guys with genuine intentions still exist?

I (27 ) have been dating a guy (26) , things are going well but I've been a little hesitant due to my past experiences in relationships which ended really bad and gave me really bad trust issues and anxiety. This guy is nice he wants to get married and have babies, I'm always laughing and calm and comfortable with him. But to be honest I'm always waiting for the next bad thing to come, which is stopping me from committing. Do good relationships really exist? Is he not too young to want to get married?
Do nice guys with genuine intentions still exist?
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