Dude… I can see how you’re feeling, but your brain is full of un-analysed shit right now.
Just because you introduced a friend to a partner doesn’t mean it was your mistake that got you here.
That’s not true at all.
If you didn’t introduce your ex to that so-called ‘friend’, she would have hurt you another time. Guarantee it.
They are just not good people… and, unfortunately, you have to be careful with who you put trust into.

This weekend was not ‘PROOF’ that you can’t be happy again. That’s bullshit.
You never said exactly when this all happened, but I assume it wasn’t long ago.
It would be unrealistic to believe all that pain will just go away after a few weeks or months.
But you have the rest of your life to live and one day, this truly will not hurt.
At least not like it does now.

I agree with the above, which said you should allow yourself to feel this way, because it has to be expected.
But, move past the fear and holding onto the past. Don’t remain with these feelings forever and stay stuck.
Anger is better than fear in this respect.
And your mind pretty much determines everything that happens to you, because if you tell yourself you’re a piece of shit who gets betrayed because he deserves it and is a loser, you won’t allow anything good in. You’ll hold yourself back and tell yourself lies like you did multiple times above. You don’t need loads of money to show someone you’re doing okay. There are a whole lot of people starving in the 3rd World, but many of them are happier than materialistic people in the developed countries, like ours. Happiness comes from within. And some of the best things really are free – a sunset, friends and relationships (not always ‘the best’, of course… but often and in time, you’ll see that again).

The past doesn’t equal the future.
And hey, it’s okay that you want to kill yourself.
Well, not ‘okay’… but natural, given what’s happened.
I’d want to kill myself at times to.
And hey – fellow depressed person here (a fair bit of the time) – so I know how it feels to be like that.
I really feel for you, as I’m sure anyone who’s read this does.
Remember that not everyone is bad… But these two people from your past are and you’ll do better without them, in time.
One day, you’ll not live so close either.

I know it feels all wrong. You thought you knew these people and could trust them.
You feel like you’ve lost it all and have nothing to live for.
But you have a future wife who will be waiting for you, if you carry on.
Your life isn’t over buddy.
And hey, don’t feel stupid because there are some horrible people, with sociopathic behaviour, in this World.
They’re selfish and only care about themselves. They will walk over their fellow humans to get what they like.
It’s not you who created this. It’s them.
Maybe you weren’t the best boyfriend or friend at times – I don’t know – but regardless, it doesn’t invite behaviour like this.

It’s okay to feel bad, but don’t believe that you will never be happy again.
You aren’t the first person this has happened to. You won’t be the last.
There are two outcomes from this.
It will break you, or you will bounce back.
If you choose the second, you need to be realistic and expect some ups-and-downs.
There will be days where you feel like you’re over it… and then days where the scars seem to be as new as they first were.

Reach out for support along the way.
This forum will no doubt be helpful for a while, as well as a therapist and some good friends.

Much love, bro

Don’t give up on yourself.