This sounds like a bad soap opera story.
Be with the one you love, if that's possible. Don't be with someone out of pity or because you feel sorry for them.
Don't be unkind when you break up with someone. They have feelings, just like you do. If it's not working out, have a face to face conversation with them and tell them it's not working out.
When you're in junior high, just be friends with boys; not boyfriend / girlfriend. There is too much drama in school to try and have a serious relationship with someone. Go on group dates and have fun.