I've been going out with this girl for 6 months now. We're not casually dating, but in a relationship. Anyhow, just recently I've noticed that I'm usually the first to text her. I text her in the afternoon, and to say goodnight. Even if I have exams and am busy with work, I usually text her first. She used to text first more often, but now it's pretty rare. She's said things like, "You're amazing...great person to have in my life, etc." There was one week where she was really affectionate, but unfortunately it only lasted a week. Part of me feels she's beginning to lose interest. Most of her replies are short now. 3 weeks ago and the week after she would call me or ask me to call her every night. She hasn't called or asked me to call at all this week, or last.
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One possibility, is that she just doesn't need the same amount of interaction. She liked it in the beginning, but can't keep it up any more.
But I'd guess that she's lost some of her interest. Either in you, or maybe she's just going through a rough couple of weeks. In either situation, she'll be rethinking her long term strategy and where you fit into it.
If you show her all of your cards or smother her with texts, then that can diminish her excitement. She'll want to reciprocate that level of affection and commitment, but if she can't match you, she'll figure that she must not be that in to you after all. Even if you are just doing what you think she wants.
Try being less predictable. Make her start guessing again, but don't over due it by pulling away entirely. See if her texting starts up again. Give her ample opportunities to be the initiator, but don't expect her to immediately.
Otherwise, another approach is to short-cut it and try to communicate openly with her. Call her out with what you said here. It's ballsy, though, and if she can't handle confrontation, she may give into you on the surface, but actually pull away even more.