Given the fact it is only my turn, in the future this woman will be raw-dogged by whoever else gives her tingles. Knowing this, I'm finding it very difficult to commit to anyone for more than 8-12 months. After that I grow emotionally involved enough to understand the for-now-commitment coming from her side isn't worth the effort. She ain't mine, so what exactly am I investing in?

Wondering how others in LTRs are dealing with 2/3/4/5 year commitments knowing the above.