I don't respect my dad anymore?

my dad seems to have been a gambler from a long time ago but i didnt know. I always had this perfect picture of my dad and I cant believe what he is now!! i feel ashamed of him. I even told him not to come to my wedding next week bcz he took money from like many of the guests there! and from my fiancee's father! if i knew that be4 maybe i could have cancelled the wedding ceremony and got married without it but it is too late now! everone is going to ask about my dad now but i dont think he deserves to be there bcz he let me down in everything in my life. he never lived with us, he is always away , i guess it is cz he doesnt love my mother. he was never open about who he was and what he wants, he is a big fat liar!! u think am i exaggerating?