From my experience as a man having dated a number of girls. All I can say is girls are as seasonal as a seasonal river. Sometimes they are so much into you. Other times they are just not interested. Their moods also vary, when she is in a good mood she will be very vibrant and fully engage in conversation but when her moods are off that's when you are likely to get short replies. Finally, this is huge. Before girls decide whether they like you or not they first check what's in for them. If you are super-successful or you are rich that's a plus. Girls also compare men, the higher you are on her list the better your chances. The lesson is as a man work on yourself first, this is how to reduce rejections.