I have a best friend turned girlfriend. Earlier I had some relationships and she knows about it. But this time I am really serious about her. But she always thinks that she is not beautiful andI would leave her in near future or I may start liking other girls. I tried many times to make her feel safe and secure but fail always. We share many things but this one is a sad factor. Pls help. What shall I say to her? Our relationship is long distance now. But I know her since school days.