It is not selfish OR entitled to think and feel this way. This person is not very responsive and is not giving you what you need and want in a friendship. Being there for you in the past doesn't relate to what this person is doing in the present moment. You say you feel better not being in touch with this person - keep it that way, is my suggestion. Follow how you feel. You don't want to be communicating with this person anymore, so don't. That's your right to choose. I understand the guilt, but you are NOT obligated to be in a friendship that you no longer want and which does not serve your needs. Let the friendship die, is my advice.