My girlfriend is ignoring me without any reason?

So me and my girlfriend, in the earlier days used to spend a lot of time together. But after somedays later suddenly she started making up scenarios that she can't spend time with me. Making a lot of excuses for not getting to spend time. Sleeping 11 hours and still saying I am sleepy. I feel so upset seeing her ignore me. I truly love her and she is taking an advantage of my love.
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I had talked with her about why she avoiding me but she said she had no reasons.
My girlfriend is ignoring me without any reason?
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