Why did my crush randomly start ignoring me?

I'm in 8th and he is in 7th. He didn't have a girlfriend when we started talking, but he does now… When we started talking we talked a little every day and some days he seemed really into me ad others he didn't reply at all. I lost his number when my iphone lost all my contacts so i snapchatted him asking him for it and he opened it and didn't reply. All of a sudden he hasn't answer anything from me. And I know he opens it. Should I try to get him to answer me? The ignoring has gone on for about a months and a half, but i'm still not "over" him. Why would he randomly stop interacting with me? What should I do? Please help.

Added (1). He started ignoring me before he got a girlfriend

It could be because he has a girlfriend now and she doesn't want him interacting with you, or he has lost some of his interest in you seeing as he is taken now.

I have to agree with the one named Siero:/

Easy. He is one of those guys who doesn't care about you unless he likes you. He liked you, and then apparently he changed his mind. He likes his girlfriend now so he talks to her and stuff.

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