Are you at a time in your life when you are looking for a long-term relationship? That could be why you having these dreams now.

Your being in love with one boy but having sex with another can be a sign that part of you wasn't or isn't ready to make a commitment, but the fact that afterwards you sort out the truth with them can be a sign that you are getting to that stage.

Death in a dream can refer to a change in your life, so the murdered lady can refer something about yourself that is changing or that you are thinking about changing. (The murdered lady is an aspect of yourself that you could be getting rid of.) Putting the girl in the hole also contains the idea of getting rid of, or burying something. A bonfire can also symbolize getting rid of old things (you throw things you want to get rid of into the bonfire), but the fire can also stand for sexual passion.

A hole can also have sexual symbolism.

The girl stripping (getting naked) in front of you can represent a need to be honest or a feeling of being vulnerable.