Hi. Welcome to the forum.
Originally Posted by MaeMae
Am I supposed to keep them happy at the expense of my own happiness..?
The short answer to this is no.
What makes YOU happy. That should be your concern.
To think that all the changes have been yours is a limited perspective. All three of you have obviously gone through changes, and I would imagine that you have all had difficulties and discomfort in this as well. But if this isn't working for you, you need to do something about it. Speak your heart with everyone in the room and keep in mind that these people are dear to you, but most importantly, you must be dear to yourself.
It sounds to me like you know exactly how you feel about this situation. And it's admirable for you to seek advice here, but let's be honest... if you "let this happen" you are denying any responsibility. Take some now and be a good steward of your soul.
Best of luck to you.