I'm not going to tell my girlfriend that I'm bisexual
Why won't you tell her you're bisexual?
I don't want her to think I'm weird.
You really should tell your partner the truth. If you're bisexual, don't lie about it; she'll find out eventually.
Don't tell me what to do.
If you want to be in a healthy relationship you won't lie to your gf. If you told her about your sexuality, I'm sure she'll understand.