I think law have problem with his mental

That was a given ever since his mum forced to do her bidding ╮(￣▽￣)╭

*forced him

The whole thing is psychological...driven by financial gain the mother abuses her motherly bond with her son and ruins Law and then Jesse driven by loneliness seeks a friendship but not knowing the correct method he causes Law more harm than help.

Ultimately we see this! A Law Chester who is uncertain, unstable and desperate.