Well me and my girl have been going together for a year now and then she tells me she wants a break but she loves me a lot I don't understand then she was like she love me to death but she's seeing other people but she tells me everything

Sounds like she's playing games with you.

How long will you let her?

No chat speak please, it's against the rules.

Sounds like even if she does love you she doesn't know what she wants. She doesn't want a relationship though that's for sure.
Don't try to figure her out. She left you. The last thing you need is to worry about figuring her out

Your girl doesn't sound like she wants to be just yours its seems. After a year, you should be use to it, or have been seeing others yourself. Tell her if your not okay with the way things are working.