How come my girlfriend got mad at me?

Me and her have been together for 4 years. 4 months ago, she started being really distant. She sometimes doesn't have time to reply back to me when I send her a text message. I only text her like once a week. and sometimes, she text me 3 days later or not at all. She claims she loves me but she is still... show more Me and her have been together for 4 years. 4 months ago, she started being really distant. She sometimes doesn't have time to reply back to me when I send her a text message. I only text her like once a week. and sometimes, she text me 3 days later or not at all. She claims she loves me but she is still distant. Just yesterday, she told me we should stop talking to her after I texted her happy birthday. (It was her birthday yesterday)

1. Did she got mad at me for saying happy birthday?
2. Would you stop communication with your boyfriend just because he said happy birthday?
3. Should I even continue talking or dating her anymore? It's like she doesn't have time for dating and affection anymore.
4. Would you continue dating her if you were me?
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