Totally wrong what you did OP.
I think you fully deserve and understand the consequences of your actions. Understandably your best mate/friend wouldn't want to speak to you again, the boyfriend, well he won't be around for long. I suspect he scarpered.
I think that you know the damages you caused and with this in mind, I'd learn from your mistakes. Draw it up to an experience to learn from and move on. Find new friends, as its unlikely you'll ever gain respect or forgiveness from your current ones. If they do, it will take a very very long time.
I once had something similar happen to me, a few years back.
I had a best mate, whom I introduced to a girlfriend I'd been dating (only for a few weeks), within a week of meeting her- I suspect he was flirting with her or doing something behind my back. I'd be messaging her, and she'd be vacant or distant. Eventually she openly admitted she was conversing with my best mate. Needless to say I was frustrated, but carried on.
When they were together they were flirty. I eventually became sick of it and dumped her. Weeks later I bumped into them in town, they were holding hands and I knew something had happened.
I've managed to forgive him- after a number of years. But I am still not bestest of friends. I haven't bothered to speak to her.
You live and learn OP.