FL feels guilty for gaining feelings for someone else while with ML

She dates the ML, but eventually gains feelings for the SML who is pursuing her. She never cheats on the ML, but she hides her feelings for the SML from him. Eventually he finds out and gets pissed. She tries to work it out, but the guilt causes her to break up with him. The SML tries to swoop in, but she rejects him as well. Eventually the ML and FL get back together after she realizes she loves him the most. Happy ending.

 appleeye:

Your description seems like a compete film's plot. If so, can you please mention the title? Makes it easier to think of other examples.

I legit came up with this. Never seen a film like that.