Timothee Chalamet Makes Out with & Serenades GF Eiza Gonzalez in Mexico

Timothee Chalamet has a new boo to call him by his name -- one Eiza Gonzalez ... who's quite generous with the PDA, especially when they're chililn' out in her homeland. Timmy and Eiza -- a Mexican actress he now seems to be dating after breaking…