<human>: I have been in three serious relationships. Not immediately one after the other, but relatively close. 
All in all, I've spent about five years in long-term relationships with about eight months collectively in between. 
And now I'm single. And I don't know how to date. I'm not sure how to not be in a long-term relationship anymore. I'm used to sleeping next to someone every night, texting someone regularly throughout the day, cooking for someone, and in general, having someone else around most of the time. 

I [21F] am starting to be interested in a guy [20M], and I feel like we connect incredibly well. I am afraid that I don't know how to be not serious and it will affect my chances of anything with this guy. Help.

Condense the text into a few key points
<bot>: don't know how to date. Don't want to ruin chances with new guy after almost five years of long-term relationships. Help.