I can't get my confidence back after my partner dumped me for another guy. I feel so unattractive, and I can't see things changing. As a first step, be aware that you are not alone. Many others are in this situation around you, or have been. Most of us, if not all, have to deal with the experience of rejection at some point.
Relationships fail for all sorts of reasons.
And it's normal to respond to the hurt by feeling you need to prove to yourself you are still attractive and lovable. You may wonder if you will be alone for the indefinite future. However, rebound relationships are rarely either long lasting or comfortable. OK, your source of love and affection has gone for the present, and it's frightening. Give yourself some healing time.