Can gay guys fall in love with a woman

My gay boyfriend is in love with a woman The 3 of us met in college and got close as roommates. He was still in the closet at the time and dealing with all sorts of self-esteem and mental health issues. She encouraged him, gave him confidence, and slowly coaxed him out, and to him, she’s the first person who ever believed in him.
The "love" is one shared by friends, nothing more. As a label definition, where it crosses the line of no longer being gay, but being bi, is when a guy enjoys having sexual relations with both men and women. To love the physical aspect of the relationship as well as the friendship, going beyond mere experimentation.