Most Helpful Guy
To break up, it is your opinion. To decide on this, is her job. Boob touching in the age of 14... you hardly can consider that relationship to be serious, life will hold many colorful challenges. However, you can suggest your friend to make aware the guy that this is not appropriate if he feels himself in relationship. Again, at age if 14 a guy has pretty much more curiosity than any image of respectful monogamic relationship. So your friend can decide it she wants to enlighten him. The rest depends on the reaction. But don't call him asshole, that doesn't help even a tiny bit. Be objective.
Most Helpful Girl
Just let her know that she can do so much better, that you don't think he's good for her but at the end of the day you have to support her decision and be there for her when they break up lol.