Why won't my boyfriend give me his number?

Me and my boyfriend have been dating a month. We met on Facebook dating and always talk on Snapchat. I told him countless times that I am sick of talking on snapchat because of the buffering and asked for his number. He completely ignores my question. When I ask him why he says " Im afraid you'll be like other girls I've dated". To me that sounds like lack of trust in me, his girlfriend.
Why won't my boyfriend give me his number?
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