Backstory is irrelevant, just go for it. Keep it simple and tell them how you feel, nothing more and nothing less.
I skipped over an opportunity in the past with a close friend because I didn't want to risk losing the friendship. Worse still, due to the different directions our lives took we're no longer in frequent contact, I hear from them once a year around Christmas. In hindsight all I would have been risking is a distant friendship, when the alternative could have been so much better.
It truly is better to regret doing something, than doing nothing - it always comes down to "what if".