VERY serious!
Usually a girl
As you are a nice man looking for a nice girl for a serious relationship, you must find one in a pub or bar and then go steady with her.
Depends on how old you both are. If either of you are 15 or under, no relationship should be considered "serious." If you are older, then it doesn't matter how many relationships she has been in, you have to start somewhere.
I am sure there are lots of ways a normal relationship can become abusive but there is one that sticks in my mind: A serious relationship. It is because if you are mainly the girl in a relationship (it is mostly the girl playing the victim and the guy playing the abuser) you are more into love than he is so therefore you push yourself into that serious relationship. As he knows you pushed yourself into the relationship he thinks he can control you now and since he knows it is serious he thinks that you won't run away because you love him.
When there is kissing and heavy touching.
A girl who can give them a good time, and depending on the guy, maybe a serious relationship
You can't, unless you have a serious enough relationship and actually met the person.
It means that she is not interested in you. She wants to have fun and not have a serious relationship at this time.
Realize that he was just using you for sex and move on.
Yes, only if the girl is much older and you are having sex with her.
When it gets really supr serious between u and the girl/boy
Do? Do all six! Juggle you are young, Have fun!