It says:
You may also apply for a residence permit on other special grounds. Other special grounds may be, for example, a stable intimate relationship and the intention to marry or that you have become a victim of human trafficking.
It is true that if you have any chance of a Residence Permit based on your bf, it is this one.
I wouldn't completely rule out that you could get that one, but I am not too optimistic about that.
Other things to keep in mind regarding this Residence Permit:
With this Residence Permit you are not allowed to work in Finland even if you would find a job.
The income requirement applies (note that even though it is called "Income Requirement", it would have to come from your savings since you would not be allowed to work in Finland) :
http://www.migri.fi/moving_to_finland_t ... equirement
When you apply for a residence permit on the basis of a personal relationship or the intention to marry, the income of the partner in the personal relationship living in Finland is not taken into account because, according to the Finnish law, you are not considered to be family members. The funds necessary to fulfill the income requirement (1. adult/€1,000/month) must be freely available, for example through your own bank account.
Processing time for this Residence Permit is usually between half a year and one year, and you are not allowed to stay all the time in Finland while waiting for the decision (except for the 90 days in 6 months).