One thing about relapses--and it goes here, as well as for alcoholics. They tend to FEED the addiction. Just because this call "went OK" doesn't mean that it's now OK to call her or email her or show up on her doorstep. I know you know this, but you gotta REALLY know it. One of the reasons I need to stay away from the first drink is that I know the first one would be "OK". Then a little while later, as that "OK-ness" works on my brain, I would try it again. You get the picture.
So you had a slip, redouble your determination.
And Happy Valentine's Day. Spend a little energy loving yourself.