Assertiveness Draining

I met a guy, and he was very enthusiastic, calling and texting multiple times every day, almost obsessively. Soon after, I was having a really bad week: too much work, health issues with my parent...just really vulnerable. He said stuff like "I'd never leave you," "I'll never run away." Well, a couple of days later, he just vanished. I blocked him after two days of no contact, and I feel kind of bad. All my girlfriends think it was too harsh, but my guy friends think it was the right thing to...