Suicide is not selfish, even though according to your knowledge of the world, there are some people who believe the purpose of life is to be thankful for the things given to you, no matter how they were created. I'm not specifying, since there are many religious statuses around the world, and I don't want to pick out what is the best. What I'm saying it suicidal thoughts aren't selfish, in a way, it's actually mindful. Recognizing your feelings as abnormal and starting to follow them is the first step, but it isn't good to pursue in them. Your therapist might need some more experience, according to their answer.