Thereís a third party involved and Iím giving up.

Iím getting fed up with so many nosy people... dozens of women from USA keep trying to flirt and steal my boyfriend away. He constantly reassures me that heís only got eyes for me and that heís loyal and wouldnít do anything would cause me not to trust him. BUT, in his line of work, Iím afraid what I fear the most is inevitable. In the long run, he might end up giving in and cheat on me for someone else. Iím close to giving up but heís making this decision so difficult for me. Should I keep fighting? Or should I protect myself and let go while itís still fresh?