It is very common to dream about someone that you have, or have had feelings for.
It happens to most people, so there is no need to worry. The truth is that dreams are just our unconscious method of dealing with pent up emotions.
Freud describes dreams as a means of communication. Our waking life can sometimes be far too traumatic so our defence mechanism blocks out a lot of our internal reality.
At night, when we dream, these emotions are translated to us through a random sequence of altered images in order to make it easier for us to digest.
Dreaming about a person you have feelings for simply means that this person is praying quite heavily on your emotions right now, and therefore your subconscious is constantly trying to deal with it while you are not awake to be traumatised by the depth of the situation.
I understand dreams can be disturbing, but soon enough they will pass, once the emotional difficulty is cleared out of your system.
I hope this helps.