<human>: Can you condense the text into a few key points?

we're together for 2 years and a half now.

maybe the title is confusing but what I meant is if she feels happy, I do. uncontrollably, and if she feels excited, I'll and uncontrollably do too, but the problem is she frequently feels sad and upset, and that means I'll be uncontrollably upset and sad, yesterday she felt that the whole day and I couldn't help but to be with her and feel the same the whole time ..

I don't even know why she gets sad, I spend 80% of my day with her and then she starts to change her way of talking, the way of talking that just makes you feel unwanted and unwelcomed, then she just says she's upset cuz she's bored...
and I don't care about the reasons really my feelings and heart just feel the same as her without questioning, even if I don't know the reasons.
<bot>: Why do I feel the same as her? like if she's happy/sad i feel the same without knowing or questioning what's behind the feelings or anything, I just directly do...