<human>: Summarize the given text in a few sentences.

My best friend of over 6 years and I have been great for a number of years. We do live a bit away from each other but usually that wasn't a problem. Recently I've noticed she has been acting differently and I tried not to let it phase me. Things like, not contacting me as frequently, sometimes cutting conversations off with an untrue excuse, and even simply blowing me off at times. After a while I grew tired of her coldness and would sometimes (rather immaturely) be cold in return or less welcoming than usual. Eventually it turned into me simply not making an effort to contact her any longer. After a while we were only speaking once a week or so and each time it seemed like we ended up arguing about something. This began after she and I hooked up once over the summer, it was her first time and I had hoped it wouldn't effect things. But since then I have slowly watched things change.
Over time things began sporadically happening in each other's lives. Both of our grandmothers are dying, her family is falling apart, my house has been broken into, my families safety is in danger, I have a fatal health issues, and school has kept us both busy. 
We used to look to each other in times of need or despair to find comfort and love. Now it seems as if every time we talk we argue about one mundane subject or the other.
At this point I just don't want to lose my friend but I also don't want to  be blown off fighting for the relationship to continue. This has become depressing for me, usually a very optimistic guy. Any advice would be appreciated, thanks.
<bot>: My best friend and I are growing apart. I feel like I'm fighting a losing battle trying to hold things together. Our lives have become tougher and it hasn't helped the overall relationship.