<human>: -So my best buddy is going out with not only my best feminine friend but the woman for who I would have given everything in,before their relation.

-They've been in relation for 2 years now and he betrayed her 3 times in total.

-The first time she got to know but it was only kisses so they settled it down. 

-The second time, she didnt get to know and I've let it passed, having decided to stay out of their stories.

-In the mean time they "broke up" because they had an argument but came back toguether 2 weeks later because they were missing each other. 

-Now its been more than 6 months since their fake break up. Me and [M] are at some friend's home with a couple peoples and he just goes down on some girl. Everybody there knows he's in couple and knows his girlfriend relativaly but he just goes ignoring it.

-The next morning in the bus he tells me he fucked up and that he dosnt know anymore about his relation. I feel the need to mention that [F]'s birthday was a couple days after the night.

-Now there's just me, tied up between staying brotherly to my "home boy" or telling the hurtfull truth to my best feminine friend. My hearth tells me she does deserve to know but I wouldnt want to loose my bestfriend even if he is the one doing "Wrong" since the start.

-I cant stop thinking about this, I dont want to see my friends anymore because of this and certainly not [F], its much to bare with. I cant hold the "blank mask" so long....

I can't thanks you enough for caring about this post if some of you do. Please be conprehensive, English isn't my main speaking language.

Can you condense the text into three sentences or less?
<bot>: I'm tied up between telling my best feminine friend the truth about his boyfriend OR protecting my bestfriend by staying silent.