Wow, those are my fears too about a long term, committed relationship. Hearing what Skeezyks says, it makes me not want to commit to one! Ha.

That aside, how do you stop from overanalyzing? You realize in the moment what you are doing, you stop yourself and acknowledge where the relationship REALLY is, and you tell yourself that, this is the beginning of things... it is not marriage, it is not a commitment, we don't know where this is going yet and I have to take things as they are and not as they could turn out to be. You have to deliberately change your thoughts when they happen.

Now, in doing so, you can also acknowledge all of your fears, but you can put them aside in knowing that the relationship is brand new, and there is no way of knowing how it will turn out yet. You take things as they are, and as they unfold....

That being said, I have heard of marriages being different than what you describe. Take my own parents, as an example. They have been happily married for 55+ years and are very much still in love. They travel 1-2 times per year overseas, they are very active socially, they're very involved in their church and with their grandchildren's lives and lead a very interesting and dynamic life together. They wake up every morning, have their coffee, read the paper, listen to the news together and have long conversations, still to this day. They are absolutely adorable to watch. I live with them right now so I see their relationship first hand, every single day. Yes, they bicker sometimes and their relationship is not perfect, but they are each other's best friend. They also continue to live their lives & pursue their interests individually, so they each have something to contribute to the relationship.

And that is how I personally imagine a long term committed relationship being, ie, you become best friends. And when you have that kind of friendship, when that person is your confidante and is emotionally close to you, conversation doesn't just end. It's also so very important that each person remains their own individual and has their own life. That way, each person has something interesting to bring to the relationship at all times. People don't die because they are in a committed relationship.

So perhaps you could focus on that -- that long term committed relationships CAN work out and people don't necessarily always become bored of one another, less attracted and run out of conversation. My parents STILL look at each other with love, attraction and adoration, and they are both in their mid-seventies! They're SO cute!!!

So, in my own opinion, you want a best friend for a long term committed relationship. Looks will change, but the friendship remains in tact. And when people love each other deeply at that level, attraction remains.