i keep remembering my past goof ups?

me and my friend both liked a same older person like 8 years older and we both knew about it and used to cooly chat about him etc and tease each other

when she couldnt handle just liking him she went crazy and i told him to go talk to her not helping her more than that

but when they were good after discussing it and him appreciating that she had realley matured to his level,he started liking her like hell and i was left to feel jealous like anything and they used to treat me likea child i used to get angry and immaturely not talk to him which made me the looser and then when i found out that he was sleeping with her in our room(me and my friend were both roommates) and her training taking longer because of spending time with him i told her bleakly what i felt and she got angry saying you liked him too how can u say such a thing against him....blah blah blah blah

and the most stupidest part was i rebounded over all this thing with another nice friend of mine and my training also took time becasue of being in this new relationship

what does this tell you about me and what should i have done at this part

i went crazy and didnt realize that all the things i was accusing her of were all coming to me too

and now i cant talk to both of them because of this and keep on remembering all hte embarassing things again and again and keep on saying what a stupid person i was