Best (guy) friend went down on me and we both are quiet now, what should the next step be?

I am in a predicament where I'm in a committed relationship to someone (relationship has been rocky), I have been helping my current bf with food, other small issues concerning money and well being. He's kind, sometimes over-emotional, into different hobbies than what regular guys are into and an ok bf.
My guy friend and I know each other longer than I have been with my current bf, often have been telling my guy friend about the lack of money and other emotional issues that my bf just can't handle at the moment. no gifts lately, and not enough gas for his car etc almost on a weekly basis
often my 'friend', had complimented me on my traits, saying I deserve better, & said he doesn't want to sound offensive but doesn't feel my current bf can take care of me. Yesterday, because my 'friend' and I are close, we were alone and things led from playful massage to fooling around. Yes I feel guilty and don't need blame shaming, but I do need advise. I am sexually attracted to my 'friend' but this is the first time we ever did anything, we both stated it was wrong however he still wanted to remain friends, invited me to stay with him on a trip. My emotions right now are a bit messed. I haven't gone that far yet with my bf, yet I got seduced by my 'friend'. I Don't have anyone to talk about this to. I really want to 'right' the wrong. I want to do it in the least painful way to my bf. I know my 'friend' said he had been interested in dating me, however said the fact I'm 'too pure' turned him off since he's more into sex, I'm not- I thought our relationship was platonic, but the way things were yesterday, I wasn't aware of how I would react to him, I thought I would brush him off or push him off, which I did but I let and he let our hormones get in the way and potentially ruin our friendship. We didn't have 'sex' but he did 'oral' and said I wasn't 'cheating'. What the hell should I do?
Best (guy) friend went down on me and we both are quiet now, what should the next step be?
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