First of all, thank you in advance for your advices (in this thread and all the information created from the start).

Second, this year was the game changer for me. I finished my computer science degree (starts masters in september), lost 11Kgs - almost done at cutting - by dieting and exercise. But i had some proporcional low by being drained and having some mental breakdown due to economic problems (agravated by some lack of confidence and non-existent energy to see the shit for the whole).

Now the main part, while focusing on my goal and climbing the montain of self-improvement my eyes were caught by the younger sister of a friend. She fits in the category of "good", by terms of beuty, goals and mindset. Some months passed and while I was caught up on finished the degree and got my shit together, sometimes we would hang out due to social bridges. I started to get more interested in her.

All the guys from my group of friends now about this condition. But, last weekend, some "bro" was out for the night and got drunk. The guy goes to her and tells her "I told I would pay you a drink, so bla bla bla"... Nothing happens.. Next, almost when he was leaving, he caught her again and put the same shit talk. Now he goes all "I told you, bla bla, here is my number". He was quite drunk and she ended giving her number.

From that on, he is acting all talking and saying that he is going to steal her from me and shit. Last night, when i hang out with my friends, he starts braging about getting her number and saying shit....

The thing is, what to do? To be precise, how do I got my shit together in this cenario by putting the guy on the spot? Also, is this the type of scene where I complete cut this guy?

I belive in loyalty is the principle of friendship and trust. And if I cant trust somebody, I dont mind talking but more than that is a big no.

Also, the guy live is the moon. He has this big image of being and always talks big, while doing nothing. For example, by braging about his physic in the old days (2 years ago) and now being/ or starting to be overweight. In addiction, other funny thing is the shit test he puts, like the above and fit test. I mean, by calling me fat - when, in reality, im no longer fat...

Again, how do I put this clown on his space and own this whole thing?