eh if you feel competition from other people then,most likely it isnt going to go far,,
like look st me and aleaf,shes bi,we dont have a relationship problem
lol serious though,if i was you i would talk to her about it,id tell her,im not rlly ready for a 3-way,and i would apprecate it if you would stay commited to me,until i feel more comfortable about the situation,
theres going to be 1 of 2 things thatll happen
1.she will disregard your feelings and look,flirt,cheat,and do her thing(now shes not worth it so fuck the hell out of her and her friends
2.she will understand and the relationship will get closer,giving you time to get used to the situation,(now shes worth it,do your thing,get used to her bein bi,then fuck the hell outta her and her friends)