There is nothing to hack. CL20 is just an error code.
Debra, while I feel for you, the problem you have isn't a tech one but personal. Hacking his phone, tracing his phone, following him, etc is all probably illegal and none of it will fix the problem. Confront him with the date site info, try to fix the relationship if you chose. But seeing as this isn't a tech problem I'm going to close this. Honestly, best of luck to you.