hi fayestump, and

Any suggestions?
yes. for starters, im glad you reached out, and i hope youll stick around and make yourself at home here as part of the family. a strong support system for you, is critical.
it will help to tell us more about the primary sources of conflict between the two of you and how they play out. that will give us a bigger picture to work with, and ways to help you better understand, as well as support your boyfriend.
regarding getting him into treatment, there is no silver bullet in terms of getting someone into therapy or getting them help. there are a variety of incentives, ranging from positive reinforcement and support, all the way to ultimatums (last resort). a bigger picture of your relationship will help us in terms of which path, and in which ways, you might want to go down here.
also, what led you to discovering BPD?