Please help... I am in love with my Cousins EX Boyfriend..?

Okay I have loved this man for over 8 years since I have known him since I was about 11 years old.. I am 22 turning 23 next month (Gemini oh yeah!!) Anyways my cousin is about 26 years old and he is now 28 years old. They have dated yeaaarrrss ago when I was about 10 or 11 and she was a teenager when she was with him she was about 16 and he was 17 (I'm an only child, so I use to go to my cousins a lot when I was younger and he would ALWAYS be with her) I was always honest, even since I was young I told him straight up that he is cute and i want him for myself and that I wish I was older so that I can be with him, I use to tell him this all the time and I even told my cousin about this so she was aware of this for yearrrsss. Now she is married and has kids, I have a son but me and his father have shared custody, and he has 2 daughters and is single like me. I NEVER loved a man in my life EVER, I didn't even say the words I love you to my sons father . Fact: you know when you are a teenager and you go through that "I love you phase" with your puppy love boyfriends? Yeah, well... I never said I love you to ANY MAN but HIM!!! hes on vacation right now and will be back on Sunday.. I was talking to him and I expressed all my feelings to him and he feels the same way about me and now that we are mature enough to be together we will be seeing each other when he comes back. BTW! MY COUSIN IS AWARE OF ALL OF THIS AND SHE SAID SHE IS OKAY WITH EVERYTHING IN FACT SHE DOESN'T EVEN CARE AT ALL LITERALLY!! He even told her as well so I know his and my feelings are mutual for each other.. Yes he is 6 years older then me but so what, my ex boyfriend was 26 no big deal. Do you think I should go for it I mean he really is the only man I ever loved and probably will love.. I mean.. Why do I still have these feelings for him still til this day? It must be fate no? Or should I forget it because he is my cousins ex but still it was years ago.. I don't know what to do? But my personal feelings are telling me to go for it.. Please help!!!!! ps.. hes an Aquarius and Gemini + Aquarius are *Perfect Love matches*............... What should I do please help..!?!??!