My boyfriend seems uninterested in me.. please help me.

When we talk over the phone he says he loves me.. but this past three days.. he says it but he doesn't sound like he means it.. everything we used to say. like baby I love you.. and sound excited.. nope that happens only so often.. I don't know we've been dating for three months and I'm his first really girlfriend.. I don't know what to do.. I asked him if he still wants to be with me and he says yes. he says he doesn't want to break up.. but why is he acting this way?
My boyfriend seems uninterested in me.. please help me.
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