i just want to tell you that if i hadn't been at the receiving end of some pretty unique experiences i'd be completely skeptical of anything other than the "when you're dead you're dead" mindset.
and without launching into my laundry list of examples and experiences i will say with certainty that there is life after this life
(i also believe that the life we are currently in is not the first incarnation we have had, and that we travel in soul groups, plan incarnations, decide on the relationships and roles we will have with each other, and what lessons we can help teach & learn from one another, as well as the joy and happiness we can share)
and, i believe, it is love that keeps us connected to those who have moved on before us; our love for them and their love for us. i believe they either stay with us or move around us or visit every now and then because of their love for us.
"we are not human beings having a spiritual experience; we are spiritual beings having a human experience." --pierre teilhard de chardin
you said "i know this love can't go on forever" -- i think you're mistaken.
your situation / circumstances will alter with time as you grow older (changes in a job, housing, health, physicality, etc.) but love is the one thing that *can* go on forever.
and it does.
of course, i don't expect you will drop all skepticism and suddenly believe what i'm telling you. (but you'll find out--eventually) 
check out "through the wormhole; season two"
disc one: is there life after death?
you could probably order it through your library
it looks interesting.
http://www.amazon.com/Through-Wormhole-Morgan-Freeman-Season/dp/B005F0TH2C/ref=sr_1_5?s=movies-tv&ie=UTF8&qid=1393734666&sr=1-5&keywords=through+the+wormhole
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