I'm in love with someone else other than my partner.
Why don't you tell your partner the truth about your feelings?
I'm scared of making the wrong choice.
It's best to face your feelings. It's wrong to stay in a relationship with your partner if you are in love with someone else.
I am scared that no one will love me.
It is normal to feel scared about that, but you need to tell the truth to your partner. You should not stay in the relationship if you do not feel like you are in love anymore.