Should I Or Should I not?!?!?! Help opinions PLEASE! Please PLEASE PLEASEEEE!?

Srry for it being long! just background knowledge but if u dont wanna read it all just go to the questions at the bottom plz

my boyfriend of two years broke up with me two weeks ago. I was going to do the same, but i wanted to do so in person, but well he beat me to it and we broke up through text. Well when we broke up im not going to say i wasnt sad at all cuz that would be a lie but i cant say it hurt that much! ( i wasnt like bella) Ok so im pretty much over him. but i spent two years and four months in a relationship so i wanted some free time away from "boy trouble" and crushes. Well that didnt quite go as planned! i just started school this monday and throught the summer I had really really tough stuff happen (1. I aslmost lost my mom twice to not go into details worst summer ever!) My so called boyfriend ignores me through the whole summer ok i took the sign... break up up ahead! didnt really care. but throught the summer i was texting his brother( who is my best friend even b4 i started dating his brother) and his best friend who I had become friends the previous year. ( first day of summer he tells me he likes me!) well i was dating my boyfriend at the time so i just answered that it was sweet but u get the idea. After that during summer we texted and stuff and well we became good friends and got to know each other better.( School just started again) And well recently ive started to feel really happy whenever we talk, when i see him n stuff so at first i was confused if i liked him or what?! And then one day i saw him saying hi to a girl... and geez did i get jelous!!! Then i got my answer i liked him!! >:0

So now im fighting with myself cuz i like my ex boyfriend's bestfriend! ( oh n my ex n i are friends not enemies or anything like that)

I think its wrong cuz Im not sure i would like my ex to date one of my bestfriends so if i wouldnt want him to what right do I have to do it to him?!

But on the other hand im really sure i like his bestfriend!

And i know his bestfriend likes me back which makes things harder!

Also what if my ex thinks i would like to date his bestfriend just to make him jelous and get him back?( which is NOT the case!!!)

Plz tell me what should i do?!

should i date him or not??

My head is a mess!!