Well, honestly masturbation is a very normal, healthy thing when it it comes to human beings. I really dont think that you have anything to feel guilty about. If you have a therapist or pdoc to talk to, you might express these feelings to them. Maybe they can help you get to the root of where the feelings of guilt come from, and help you cope with that issue. Maybe if you are able to cope with the issue the guilt stems from, you will no longer feel guilty about masturbation. As far as the feelings of sadness, waht are you doing for yourself to help move on from the ended relationship? I think the feelings of sadness will subside when you have fully moved forward from your ex. Best of luck ((hugs))