You really think the police would get involved if someone came in and said "I think someone tried to hack my dating profile." No.
Also there aren't people who monitor how many incorrect passwords are used. Most sites you get anywhere from 3 tries to 10 to unlimited tries to get into an account. I have forgotten my passwords for things and tried to get into something multiple times and then I just changed the password. If I got a notification that someone tried to access my account, I change my password.
Stop trying to hack your ex girlfriend's dating profile and get a life.

