I have a question about my girlfriend and cheating..?

Ok, so me and my girlfriend have been together for 5 months and 4 days now. She swears to god that she has true love for me. She swears on her life and honestly...I have true love for her also. She's the one for me and she tells me everyday how im perfect for her and how we are soulmates and how she wants to spend the rest of her life with me. I feel the exact same way about her. So about 3 months ago she confessed to me that she was developing feelings for a friend of hers that she used to like about 5 months before going out with me. Oh and i see her once a week or every 2 weeks and she sees him every day (during school). After about a week of taking a break to figure out her feelings...she realized that im so much more important to her and she loves me. But im nervous she's gonna cheat on me. She tells me every day that her and her friend are JUST FRIENDS and how she got cheated on with her last boyfriend and how she wont do that to me. But tonight shes going out to the movies with her best friend( the boy that still likes her that she used to like) and her other two friends (one guy one girl) and im just worried. And she told me how she would choose me over friends EVERY TIME and this time she chose friends over me..we had plans for today but she said she wouldnt see them next year and didnt want to drift from them. Shes not texting me tonight but she will after. So i just need some advice...do you think she is cheating on me with him? there are lots of people that want us to break up and say "oh shes cheating on you with him!" but her CLOSE friends say she isnt and she swears she isnt...but do you think she is cheating on me? what should i do? im terribly afraid to lose her.....