Ladies Do you think my Girlfriend is cheating?

[WaterMelon]

Guys can say their thought but i really want the ladies to answer since they are girls and they can base it off what they do. Okay.....So my girlfriend i was dating for 4 weeks now is giving me doubts.....these are reasons why i think she is cheating. She has two facebook accounts. I asked why, she claimed she forgot the password but was just on the other account last night. She never text me like that anymore. She got upset because her Ex is getting married. She lies to me. She has a good bit of guy bestfriends. We got into an arguement today and she was quick to dump me and later kissing back up to me and stuff. Is she crazy or is it just her period that make her this way? What should i do to keep me from stressing?

[PinkKitten]

You mentioned that her ex is getting married - even if she has no feelings for him anymore this is bound to have an effect on her, which could explain the strange behaviour.