I have the same feeling that she has other boy friends. If you just be patient and wait, you are very likely to lose her in the final. However, it depends on your own feelings. If you are really into her, just go ahead and show your real love to her. Don't offer her too much time to meet others. And if she still treat you like before, you should consider to give up. The reason is she may have someone better than you (at least in her eyes.)
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