I've never gone through break up before... since this is the only and the most serious relationship i have had.

It is completely my fault that i flirted with some girls online...twice
I lost my trust that i had given her, and the security i had provided to her.

It's been almost a month already. I can feel that this relationship is pretty dead... I tried to text her few times a day...either no response or only few words. I feel that she isn't even mad anymore...she just doesn't have the feeling to me anymore

this is my biggest mistake i have ever made...I didn't know what to do. I even google to see what can do i to get my ex back... and found some article quite useful and I'm try to follow those advise. 
However, they have not answered my real question. 
I recently found out that she's been with someone else couple days after we broke up. I don't think she's seriously about it tho. I still love her and don't want to give up.

My question is If i ever had this chance to get her back, but in between the break up period she probably slept with someone else, what should I think of it and what should I do? Maybe this question is dumb as fuck, but i just feel like my brain got stuck and can't think about it thoroughly
user
I fucked up with my gf. We broke up and she's been with someone else
assistant
I've never gone through break up before... since this is the only and the most serious relationship i have had.

It is completely my fault that i flirted with some girls online...twice
I lost my trust that i had given her, and the security i had provided to her.

It's been almost a month already. I can feel that this relationship is pretty dead... I tried to text her few times a day...either no response or only few words. I feel that she isn't even mad anymore...she just doesn't have the feeling to me anymore

this is my biggest mistake i have ever made...I didn't know what to do. I even google to see what can do i to get my ex back... and found some article quite useful and I'm try to follow those advise. 
However, they have not answered my real question. 
I recently found out that she's been with someone else couple days after we broke up. I don't think she's seriously about it tho. I still love her and don't want to give up.

My question is If i ever had this chance to get her back, but in between the break up period she probably slept with someone else, what should I think of it and what should I do? Maybe this question is dumb as fuck, but i just feel like my brain got stuck and can't think about it thoroughly
user
broke up with gf, she's been with another guy less than a month after break
assistant