Things are different between my girl and I after a 2 months?

She would send me random sexy pics. Text me first all the time. Now its like I dont even seem like I matter to her. She replies slow. won't even send me selfies anymore. Could she have found someone else? I don't know what I should do? I've talked about this with her but she says nothing is wrong and everything is fine. It kinda feels like she's protecting my feelings in a way. by the way this only happens when were not together. If im. with her she's like completely different. I just overthinking it?
Things are different between my girl and I after a 2 months?
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