ML dates FL knowing full well she's in love with someone else

As the continue to spend time together, eventually her chance to be with the one she loves happens and the ML lets her go. This selfless act plus all the time she has spent with him makes her choose the ML in the end.

 ahsaaful:

Daytime Shooting Star

Seen it, but thanks.

• Date - Koi to wa Donna Mono Kashira
• Jealousy Incarnate
• Long Vacation
• Money Flower
• Moonshine and Valentine

Some of these aren't exactly what you're asking for but they fit along the lines of someone being with someone but loving someone else.