Even though I'm in a relationship with another partner I can't help but still be in love with my ex, and I refuse to explain it to her.
How would you tell your partner if you decided to?
I'm still in love with the latter, I really do love that person.
If you still love your ex you need to tell your partner. If you continue to hold this in, it will simply bubble to the surface and youll end up hurting your partner even more down the line.
I'm a coward, she will break up with me if I tell her and I won't be able to handle that.
If you truly love someone else then you need to let both of them know so that you can move on. Clearly your current relationship is not working out and you need to pursue a new one.