BORING! life is short (I know hard to comprehend at 19) if you think about every little thing than you might miss out on some great experiences.
You might be looking at this wrong. Don't hang out with this guy looking for a lifetime partner (I firmly belive a man should not get married in his 20's) Hang with him because he makes you laugh, treats you nice and makes you feel beautiful. Sometimes relationships are part of transitions, they aren't meant to last but it doesn't mean that can't be meaningful and fun.
Kevin kissed me when I least expected it. He was giving some speech about how we were friends and he didn't want to mess anything up and how I just got out of being married and didn't want a boyfriend and he was a one woman kind of guy. yada yada yada yada then bam-he kissed me. We were very casual for months and months (I was enjoying being single

) then one day I just realized I loved him. That was it.
My ex-husband fit some perfect mold and in the end he didn't love me for who I was. I overthought that one and regret it (except for my son of course)
experience life! ::::getting off my soapbox now:::::