Losing friendships sucks, I'm sorry to hear you have an experience like that looming ahead.

I know the feeling of not being good at staying in touch. I have a hard time with that myself. Part of it for me I think, is that I'm not normally a talk-everyday kind of person, and I'm also a "binge then abstain" kind of person (by which I mean something will catch my attention for awhile, I'll focus hard on it then drop it for some undetermined length of time before picking it up again). This doesn't really work well with friendships, since most people aren't happy with contact being days or weeks apart, although that doesn't seem to be my modus operandi with all of my friends.

Wishing you hugs and luck, and hopefully that second relationship doesn't turn out the way you're dreading it will.