Best friend has changed completely after his breakup.

So my best friend and his gf broke up back in August just before he was about to leave for uni. It shocked me because he had been smitten with her and she had loved him a lot too but I didn't say much about it. My best friend was really upset the night they broke up and then literally two weeks later he was going clubbing and pulling girls. I thought he was just trying to spend some time with his other friends (who are literally the typical lads) The real change happened was when we both went off to university together. During Freshers week, he started having one night stands and got really drunk. A few weeks later he started openly bitching about his ex, which annoyed me a little because I sometimes talk to her and she's always lovely to me and has never actually done anything like he's doing. Anyway, he started calling her ugly and pathetic and that he preferred one night stands over a relationship anyday. We got into a massive fight when I told him to leave her alone and that bitching about her made him look bitter.
He's normally a very chilled and calm guy but ever since he broke up with her he's become angry,aggressive, he's been partying too much, he's constantly boasting about how much he sleeps around and he is literally against the idea of relationships because it's too nauseating apparently.

We're not talking atm because he's still annoyed at me but by the impression I'm getting, I think he still has feelings for her and he's trying to fill the void by trying to be all tough.

I'm a girl so I'm clueless with this so can anyone help? Sorry for the long post.

I can't help but feel like I've heard this before.

Let them both get on with whatever they're doing. If you're really not one of the two people involved then just.. I dunno, try to talk him round. But if it doesn't work, then there's nothing more you can do.

Yeah I put the thread up before but it got put down for some reason. It's getting worse so I wrote one again.

His ex is getting on with her final year at A levels and she doesn't mention him unless it's to address how bitchy he's being.

I'm wondering why he's being like that. If other people can guide me in the right direction and give suggestions as to why he's being like that, maybe I can talk to him.

I see. I am sorry that I can't answer your question.

But I would say focus on your A-levels, don't address him for any reason whatsoever and try to move on.

I'm at uni haha.

He's my best friend so we're going to end up talking sooner or later.

with that move, I'm afraid you have given yourself away.

ex and best friend.. I'm sure down the line you could be best friends but if you're not completely over him and.. well, who knows what's going on over on his end, then it's just going to be messy, painful and boring.

Seems like hes missing her init and the one night stands don't fill the empty cracks in his heart ha ha

Erm have I..?

He's not my ex. He's my best friend who broke up with someone else and he's changed ever since.

I actually mentioned this to him and he was like, "Oh I love my life it's great without her, she was a nightmare to be with etc etc"

I know who this involves.
He's a c***. Yeah, he may have been ok before but his actions have been brutal and thoughtless. Immature af.

If i an wrong on who this concerns (which is highly doubt) then....
The guy might grow out of this 'phase' and he hasn't moved on. He is literally 'drowning his sorrows'.
Kid might come good but i'd always be wary of him going forwards. I know he was your 'best friend' but he is showing his true colours to some extent...

Edit: turns out i'm wrong here. I do not know the people concerned. Whoops...

It seems as if he's missing her and he's going through an angry stage as he tries to come to terms with the breakup. Calmly explain to him how immature you think he's being, and if he still doesn't change then just leave him to it and when he realises he's acting like an idiot he'll stop.

I told him when he first started bitching about her that he was being immature but he told me to stay out of it. When we had our fight, I called him immature again and he said how his life was amazing without his ex etc.

I am thinking of leaving it to him but tbh he's being fake. He isn't like this normally at all. When he was with her, he was much happier and more confident in himself. Now, he just talks about how uni relationships are a waste of time.

Pride? He can't admit it due to pride...
Idk really, only he does. Why do people change, it always makes me think 'were they always so genuine previously?' The answer i have found is usually 'no' thus far. That may not apply to your case though...

Yeah, he's a w***er from what i can tell.

He's hurting a lot and people say things they don't mean when they're upset. Let him ride it out and eventually he'll be back to normal, he just needs to overcome it on his own. If he doesn't, then there's nothing you can do.