High School... 3 years Went different directions after HS. Amazingly after 50 years we started to keep in touch again but only as email and facebook connections. She lives in Conn. and I live in NC. Don't read anything into this, she just celebrated their 50th wedding anniversary and I just celebrated my 22nd post divorce observance.
Second... lasted 29 years with many odd reasons for breaking up. None made any sense. I've had a few relationships since then but none serious, at least on my part.