<human>: Hey all,

So I'm a 19M and I've been friends with the first girl for almost 4 years now, let's call her Diana. Back in March. I asked her out and she said no, because even though for months she was giving me positive signs, I simply took too long. Anywho, she's away for the summer and she called me saying how she would like to try "us" some point in the future after she's back, essentially next year of university. We've been friends for years, and even after I asked her out we're both mature enough to move past it real quick and nothing really changed between us until she called me a couple weeks ago.

The issue resides, should I feel attached and not go for anybody else besides Diana? I have another friend who's not away for the summer and yesterday she gave me some pretty good signs that there might be something more to out friendship, but should I go for it? Will I be risking Diana's possibility of more-than-friends? Is it simply worth it? 

Please advise  
-HFML

Could you distill the essence of the text into 1-3 sentences?
<bot>: Friend who wants to try being more-than-friends is away for the summer and we're just friends for right now, but because she's away for so long is it worth going for someone else in the meantime?