Is she ignoring me....?

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So today, she hasn't sent a single text to me besides the one earlier when I told her happy Easter.... She is posting things on Instagram yet is ignoring my texts.... Is she mad or just lost interest? Yesterday, I brought up some questions I had because I was hurting over her and this college guy who kept spamming her with ab pictures and stuff when he has a girlfriend... She said nothing is going on and I told her I believed her... And after that our conversations grew shorter and shorter... And now today I'm trying to stop myself from sending a message spamming her asking why she won't respond to me.... Help... What might be happening?