<human>: Can you provide a brief rundown of the text in within 3 sentences?

We've been dating a little over 2 years now, a lot of which has been long distance. Currently about 6 hours apart. I know /r/relationships likes specificity in questions, but that's where I'm having trouble. I feel like our relationship is dying but I don't have a specific reason.

On paper we are an excellent match. We have nearly identical interests and are very supportive of each other. But she doesn't always fulfill my emotional needs. She isn't the best at having real, intimate conversations and it leaves me feeling like our relationship is missing the kind of connection we used to have. For the past few months I have just felt so apathetic about our relationship... really I've felt apathetic about everything. I get frustrated with her sometimes, which is probably unfair, but I find that little things she says or does just bother me now. This didn't used to happen. I just can't get the idea out of my head that there's someone better out there that's better suited for me. 

I care about her a lot and I think that in another life we could've been best friends. But I know she sees us getting married someday (we have talked casually about this, but never anything specific). I don't want to hurt her but I can't stop thinking about being with someone better suited for me.

I guess my question is... how can I know if it's really over between us? I've been sad a lot lately and I don't know if I'm just dissatisfied with our relationship or if I'm having a bit of a depressive episode. I don't want to end things with her if this is just a phase I'm going through right now, but I just can't tell.

Thanks. I know this is vague and general but I will answer any questions that might help.
<bot>: Apathetic and dissatisfied with current situation in life and relationship but can't tell if general sadness is causing problems in relationship or if relationship is causing sadness. How can I know if it's time to end it?