Hi I am a leo sun, mercury cancer, scorpio rising and moon in sag. My last 2 boyfriends were cancers and in the beginning everything was great. They were both very affectionate, but had serious control and anger issues. Yes, overly sensitive too, not to mention jealous. I had to sever all male friend relationships with the first one. I have heard of leo and cancer relationship where both are actually happy together, so there are exceptions to the rules. I tend to get along with cancer women pretty well. My current boyfriend is a sag and he is not jealous at all and would never speak to me the way my ex's did. I guess the only thing I really liked about them was their attention and affection. As a leo I can say that in the beginning of a relationship I am very demonstrative with my love, but if I don't feel I am getting the same in return, I retreat. We need equality. All I can say is don't judge someone by their astro sign, but stay aware of any red flags. I saw some with the last 2, looked past them and regretted it. I wouldn't make a serious commitment till you are ready.