Thank you all for the input.
I'm aware of the I-864 and the responsibilities that come with that. I'd rather not go into all the personal details of our relationship in regard to marriage counseling or other matters, etc. Usually there is more than one reason why a relationship faces difficult times, and this holds true for our case-- I've mentioned one of the items that have come up in our talks as a couple (feelings of uncertainty about the future and homesickness). However, I will say that I am inclined to believe that perhaps my partner has fallen out of love or at least has uncertainty about the relationship-- which goes hand in hand with the homesickness. At the same time, I'm also inclined to believe that my partner may also desire to have the opportunity to go through another K1 process in the future, if that may arise based on our talks. Thus, the homesickness may be a result of the situation with myself and my absence due to an unrelenting and time-consuming work schedule. That's about as much personal information as I feel comfortable sharing.
In case things do go south, I'm trying to understand the implications for both parties, myself and my partner's, and I would like both of us to come away without damage to our records when it comes to immigration procedures. I'm not overly concerned about the responsibilities of the I-864, despite its large burden on the sponsor. Do we try to work it out now and wait to file the AOS or file for the AOS while working things out bearing in mind that we are having these discussions and the end result of our relationship is in doubt?
Thank you.