Remember your love one who has passed away, if they truly loved and protected you in the living, would they want you to constantly be mourning their not being around or feeling guilty for any reason?
No they would not want you to go through that. They would want you to move on, as your happiness in life is a sign of what they tried to bring to you in the living and possibly hope their life meant some happiness for you while they were alive.
Being in constant sadness, guilt or mourning makes all their efforts in the living lost as that is not what they would want for you be they alive or gone. There is nothing to feel guilty about as far as they are concerned, they have moved on to a better place of love around them.
The guilt is pain that you are causing to your self and of your own doings, not something the spiritual love one put on you and would be disappointing in the fact you are causing your own suffering over them as that is not what your love one's spirit would want for you or for you to act that way.