My boyfriend had his ex-girlfriend's phone number saved under a guy's name! And that means..?

So I found out that my boyfriend of almost a year had his EX girlfriends number saved in his cell under a GUYS name. WTF is that supposed to mean?
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Well I called him out on it as soon as I found it. His friend actually gave me her number and told me to look in his phone. Ha! Funny sh*t. :\ He said that he had totally forgot that he had even done that.. Yet he's only had his phone for a few months?!
My boyfriend had his ex-girlfriend's phone number saved under a guy's name! And that means..?
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