Why do guys run away as soon as things get serious?

Anonymous
Say you're taking a girl out on dates, introduced her to your friends, and yes, sleeping together but you're not "official" - but as soon as she refers to you as her boyfriend, you stop calling her - why?!

that pretty much happened to me, I was with this guy for a few weeks and we'd talk every day and hang out like 2 or 3 times a week, and he was really sweet and would tell me how I'm special, etc, but as soon as I referred to him as "my guy" (I didn't even say boyfriend) I stopped hearing from him, and he gave me this excuse about being busy "trying to get his life back together" (he had a bad breakup a few months ago), so he wanted to "take things slow" - wtf? my only guess is that he wasn't ready for another relationship so he bailed...

but I mean if things are getting too serious for you, why not just back off a little, why do guys have to end things altogether and run away?!

and more importantly - how do I get him back? should we just start hanging out again without the pressure of acting like bf/gf?
Why do guys run away as soon as things get serious?
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