Trouble for a relationship or not?

Here's a chance for all my readers to jump in with advice or opinions...

So, my roommate was telling me last night of a time when she was in Cleveland (her mom was in the hospital there) and decided to look up an old college friend, Eric, who she knew lived in the Cleveland area. She hadn't seen this guy in a few years and they had been pretty good friends in college, but had never dated and had just lost touch. Well, she found his info, called his number and got a voicemail or answering machine message that said something like, "You have reached the home of Eric and Danielle..." She immediately hung up and decided that she wasn't going to leave a message and get Eric in trouble.

My question is, seriously? Am I in the minority here for thinking that Eric having an old friend, a female, contact him out of the blue because she was in town while her mom was in the hospital, is not a big deal and certainly not a relationship killer? Would someone seriously get mad about that? I do see how it could be trouble potentially for a guy you are with to have a really close relationship with another female but are you seriously going to prevent and get mad about every female he might come into contact with, even those that occurred before even meeting you? Does an out-of-the-blue phone call from someone you might not even know immediately spell trouble? I don't know; it sounds ridiculous to me. I'd be thrilled to receive a message from an old friend I've lost touch with, guy or girl, and would never expect that it would spell doom for my current relationship. But, then again, I am single, have been treated like crap by most guys I have dated and am probably pretty naive, so what do I know?