From IMDB:

Tel Aviv, Summer 1989. Boaz, a beautiful and alluring linguistics student, receives anonymous, male-written, love letters that undermines his sexual identity and interfere with his peaceful life with his beloved girlfriend.

From Amazon Prime you can stream this 1 hour 21 minute Israeli film with English subtitles.

In this well-made gem of a film, the bisexual Boaz is tormented by his homosexual tendencies and fantasies which add conflicting tensions in his relation with his live-in girl friend and lover Noa.  One major aspect of the story is: just who is this male stranger that is writing love letters to Boaz?  Because Boaz is handsome he continually gets admiring glances from women and men. With each such male admiring glance Boaz asks “Is he the one?”

Be prepared for much explicit straight and gay sexual activity . For example to relieve his sexual frustration, Boaz visits gay cruising spots in the park.  But his personal conflicts lead him often to be brutal to Noa and confrontational with male advances.

You will just have to watch the film to see what Boaz’s decision is because I will never tell.