I tried to do an "exorcism" on my ex!!?

I'm a God fearing Christian woman and I just saw my ex in the library killing time cause he's homeless and I tried to rid him of bad spirits but he fled. He's got a good spirit somewhere in there but he's allowing evil to overtake him. I'm not delustional or trying to joke around I just wanted to help him cause he taught me alot of useful things when we were together cause he older than me but I don't want him back ever!! I felt his spirit and it almost made me sick but I felt a tiny bit of good in there. God Bless!!