I wish I knew how to end this...

My fiancé have been non stop arguing. He made me cry when I dropped him off at work. I went inside and one of his co workers that is also my sons god father knew by my face something was wrong, he came up to me and hugged me and said “Lets talk. I will take my break now.” This man is seriously the best. He is so good with my son, he always makes me smile, he makes me laugh. I just feel terrible for falling for him...