Is it the time to let go?

I have a girlfriend. We've been dating for almost 2 years now. Everything seemed fine but then a couple of days ago I texted her but she wouldn't reply at all. Almost a day no reply. Nothing. The next morning she told me that she won't be replying to my texts bcs she needed some time alone. So another couple of days passed, I asked her if she's okay and she said yes. I was convinced. After that things went back to normal but this time every time I texted her, it took her quite some time to reply, 4 to 5 hours. She's online but no reply. She posted a lot on her IG stories and even Snapchat. So I asked her if she's bored with me, she said no. She said she'll tell me if she's bored with me. Now I don't know what to do. I tried my best to keep the relationship, i tried my very best :') I did everything I could :') I can't really blame her right? I can only blame myself for trying too hard :')
Is it the time to let go?
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