<human>: Can you succinctly summarize the text in 1-3 sentences?

I (29f) have 2 friends Chris (29m) and Sean (29m) who I've known since kindergarten.  2 years ago Sean told me that he was in love with me and wanted to be with me. I don't have the same feelings for him so we lost touch until recently where he again shared the same feelings. 

In the last month I find myself increasingly thinking about Chris and wanting to be with him. I'm pretty sure the feeling is mutual. You can feel the sexual tension between us and there have also been those moments of eye contact where you can just see and feel it... he's also gone out of his way to help me, bought me things and I've been to dinner with his parents 4 times in the last 2 months, which hasn't occurred before. I don't know what this says about our relationship and makes me a bit confused. 

The problem is that the 3 of us hang out quite frequently  (a few times a week) and I'm afraid to move forward with my  feelings for Chris because of Sean. I know how he feels for me and so does Chris. I dont want to lose Sean as as friend nor do I want him to feel hurt or betrayed if Chris and I were to start a relationship because of the history between all three of us. I'm not sure how to move forward without hurting him.
<bot>: I'm falling for my best friend since kindergarten. Our other best friend since kindergarten is in love with me. I don't want to hurt anyone's feelings and don't know how to proceed.