<human>: Can you give me the gist of the text in a nutshell?

So I've been dating this girl for about 3 months, we were not exclusive, and were friends for a while beforehand. For the first two and a half months or so, we talked every day for 2+ hours, sent 3-4 texts everyday, and saw each other 2-3 times a week generally due to time issues. 

For about the last two weeks though, communication has gone almost down to nothing. I still see here twice a week, and when we are together, it's great, but other than that, she hardly contacts me anymore. I might get 1-2 texts every 3 days. Sometimes when I contact her, I get no reply. She also does not call me anymore to just talk. 

I've brought this up, and have just been told she was busy, etc. 

But still...my obvious thoughts here are that there is someone else, and I'm old news. 

(She refuses right now to be exclusive with me, because she is not ready to be in a committed relationship. To be frank, I hate this. I don't like dating multiple people at once, it makes me feel cheap. But I'm trying to get used to it. Is this a common thing these days?) 

Of course, it's also possible she just burnt out on constant talking and texting. 

So I guess what I'm asking is....should I just leave her alone, and if she really cares, she will eventually contact me?

I don't know if I should contact her or not. I just feel sad, like suddenly I'm not worth talking to. Did she just get comfortable I would be around? I feel like if she missed me, she would call. 

I'm sorry this is long, I'm just hurting and need advice. Thank you everyone!
<bot>: Girl I'm dating who wont be exclusive with me has suddenly dropped 90% of all communication. Not sure what to do. Leave her alone and see if she comes back?