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You've clearly landed on the radar of Singapore Immigration for visa running. There is no automatic reset period, and further attempts to visit Singapore visa-free without strong business reasons are likely to be treated with deep suspicion.
If possible, I strongly recommend you apply for a Long-Term Social Visit Pass, which will let you legally stay in Singapore beyond 30 days. However, depending on your boyfriend's Singapore residence/visa status, this may be impossible, in which case I would advise that he come visit you in the Philippines instead. Marriage may also be an option, although this too depends on his residence status.