You must deeply love your partner. That feeling is never light. I have tried to give up many times, but I can't give up. You shouldn't force yourself to give up this feeling in the first place. Because in the future, there is a good chance that opportunities will come to you. It seems like your partner is not compatible with your friends. You may break up someday.
Therefore, instead of forcefully intruding on the emotions of two people, just waiting for them to separate is sufficient. Rushing is not recommended. If you do so, the emotions with the other person will surely progress smoothly.
First, it's not a good idea to have a deep sense of guilt about falling in love with a friend's partner. Love is something that comes from the heart, so be honest with your feelings. However, engaging in a love triangle is not morally acceptable. It's best not to deceive your friend and secretly date someone else. Acknowledge these feelings and nurture them inside. By doing so, you may shine brighter as a person in love and increase your attractiveness to others.