Himmel also auch auf Erden. Brot gib uns heute. Humanly speaking, we have emotions. Clearly we should not sin in our anger. In fact, we should be particular in a choice of a partner.
Rejection always tends to hurt some part of the one who feels rejected.
Either they feel angry at being rejected and blame the one who does the rejecting, as you describe, or they feel hurt in connection with their self-confidence and feelings about self. There can be a lot of self-pity and self blame at those times. As you continue to talk about it in your message, you come to a sound, Scriptural way of looking at rejection way at the end. Forgive me for my feelings of anger and keep me from desiring to get revenge. I know that it is always best for me.