She has shown you who she is as a parent. This is the parent she is to this kid and if you to had future children she will be the same bad parent to them. You are young- cut your losses and move on. Go see the world and meet other people in it .

It may be also worth when breaking up with her explaining that part of the decision is because of her child and his behaviour. Tell her he has scared away him with his poor behaviour and her poor parenting and that he will most likely scare away other men in future. Also toddlers become teenagers and if they haven't been thought respect toddler aggression becomes teenager aggression. You love her enough to ask her to protect herself with some parenting classes so that she doesn't end up in a bad situation later on

Do all three of you a favor and walk away from this doomed relationship.

I would like to tell you to hang in there, it will get better. Trust me, I know from experience it only gets WORSE. You love your GF now and can't see a life without her. It is only rosy and wonderful except for her son which you may be able to tolerate NOW. There will come a day when you start looking at her differently. You will wonder why does she tolerates this behavior from her son. You will see her as a weak person. She will change before your eyes. You will begin to wonder what you ever saw in her. You will see her blame everyone for the child's behavior except herself.

She will convince you that if his father was around more or if you spent more time with him, he will do better. You just need to bond with her child and understand that he is just seeking attention because he needs a really good male role model in his life. The child has already learned how to control her so there isn't anything you can do to change it. She has to be the one to step up and do it. She will tell you that it is too hard and that she needs YOUR help. You will be the only one parenting until your GF decides she doesn't like your parenting skills. You will be too hard on her child. You are in a no win situation.

Picture this child at the age of 13. He is cursing out his mom and he decides to slap her. YOU can't do anything. Because if you try, social services is going to be called on YOU. Trust me, the story you tell social services is going to be very different than what your GF and her son will tell them. She may love you, but she will not throw her child under the bus for you.

You need to take a week or so break from this relationship. You need to really sit down and determine how life is going to be for you. You are sitting yourself up to live in a nightmare. A few years from now, you will be wondering HOW this happened to you. Do not bury your head in the sand. Children who are not disciplined at a young age grow up to be teens who are not disciplined.

I know from experience that love does NOT win when there is a child who has behavioral issues and the parents do not wish to address the issues.

This is sooo much like my life. Does she take things on board that you tell her though? My partner does but doesn't if that makes sense. He's starting to realise he's a shitty father (I hate even saying it, but it's true) though and is considering giving his son to BM but then says she's a shitty parent too *sigh*. Do you live together? And please use protection. Only saying that because I got pregnant really early in the relationship and it now makes things so complicated. But we don't live together as I'm no where near ready to take his son on.

You're 23 and have a lot of life to live. So you "never felt same feelings for anyone before". Again, you are 23. You will have other chances to fall in love and the new love may make this one pale in comparison. The "great love" I felt at 23 is a drop in the bucket compared to the love I have for my DH.

Her son is, what, 6? And looks exactly like his father. Well, it's quite likely he will look like his father his entire life. The kid cannot do anything about his looks and it's childish of you to resent that. Also, he's mean because your gf is a lousy parent.

You are YOUNG. Get out of this relationship, get out in the world and LIVE.