Hello RedAzure,
I'm really glad that you have found us, you have come to the right place.
Being in a relationship with a SO who has BPD can be psychologically exhausting, so feeling tired is understandable, but by continuing to post here we can help you find ways to start taking care of yourself. We can also offer you guidance and support through shared experiences that will help you find positive ways of coping with your h's changes in moods and behaviours associated with BPD.
When I first came to this forum I too was tired and emotionally overwhelmed from trying to cope with my dBPDh. For me posting for ongoing support, reading all the info that this site has to offer, slowly starting to use some of the techniques in my relationship has turned my life around.
Can you tell us a bit more about you and your life so that we can start to get to know you a bit better and then we can begin to give you more specific advice and pointers on how to start talking steps toward handling situations in a way that helps you feel more positive.