Red indicates passion whereas pink indicates true love with caring friendship and romance.
If possible, then light them and conduct a short visualization where you see yourself in a happy, loving relationship. Do not get into detailed visualization, but simply see and feel yourself being happy and satisfied in a healthy, loving relationship.
Doing this with intension, puts out the energy message to the Universe, that you are looking for someone loving, to share your life with.
As with any remedy, it is important to do this with intension and faith; BUT at the same time giving up your attachment to the outcome. You need to remember that Universe will ultimately give you what is best for you and at the right time…