<human>: Could you distill the essence of the text into 1-3 sentences?

I've [m27] known this girl [26] for over ten years. When I first got to know her I was in a serious relationship so I never looked at her as anything but a cool friend. Now year later and a few relationships later I find myself 'thinking what if??'
Like any new possible relationship I'm not sure of where this will go but unlike any other past relationship this could mess up a great friendship.
From her recent actions I think she likes me also but cause we obviously care about each other (as friends) I'm unable to read the messages, if any! I need help please!!
<bot>: I think I [M27] am starting to have feeling for a long time friend [f26]. I don't know how to act upon them? If I should act upon them?