just be yourself. if they liked u before, then they liked u for who u are.
You should go for it if you know that person likes you go for it no holding back.
If they like you back
just tell them that you have a crush on the person to and you can work something out together
It depends on if the person likes you back
Apologize and try to get her back.
If the said crush is currently happy with the person they are with then no. If you truly care about your crush, you will let them be happy with the person they choose.
My advice for you would be tell the person . If you are close and have had each others back you might have an idea that the person might like you back. Take a leap. Always helps :)!
Get back with that person you loved before.
depends how much of a FRIEND that person is to you.
Not too intimately.
First you should wait and see if the person you liek says yes to your friend. If not, you have a chance to ask out your crush. If your crush says yes to your friend, you should tell your friend that you like the person they asked out. If it is a true friend they will see that they have hurt you and give you a chance to ask your crush out :)
they probably like you back.