My LTR and I have been together for about 6 months and it's a good relationship. Now we've told each other I love you before but it was at the beginning of the relationship and through text messages. She's been saying I love u alot in text. I told her I loved her today and she didn't say anything back, I asked her about it and she said she was nervous and feeling a bunch of emotions. I acted cold towards her, ignoring her attempts at my attention until she left. What does this mean and what should I do?