I don't think you're over-thinking at all. I moved here from California with my partner on a whim several years ago - wanted something different, assumed we would move back and forth between countries, fly a couple times per year, etc. Then settled here for good...

THEN, last year, I attended a climate change meeting and realised that I cannot continue flying so much. Since then, it is a constant issue, and I face a future without seeing my family very much. It's so depressing. And stressful - I've had to turn down weddings and gatherings galore - and each time I fly over, I have to explain to my father in one state or my grandmother or best friend or brother across the country why I can't make it to see them this trip. It really sucks. BUT, I'm not willing to give up my life and family here - and we're not ready to move as a unit to the states and have my partner experience the same thing with family in the UK.

Skype and other web services have proved invaluable - I can see and chat to friends and family for free whenever we like - but it doesn't make up for all of the missed experiences. My best friend expects me to be at her wedding in California next August - but in September my family is having a massive gathering on the other side of the country. I cannot do more than two flights per year, and I can't stay in the states for a month or more....and people take it so badly when I miss things! Argh.

My advice to you is to meditate on where your values lie - how flexible your future would be and how much you could give up. I do love it here but there is a constant sadness in the pit of my stomach because of this choice.

Best wishes to you!