<human>: My bisexual girlfriend was with an ex who was a girl for 3 years; they were best friends for a year before dating. A couple months into actually dating my girlfriend felt very strongly that she would end up marrying this girl (they broke up because her partner fell out of love after some time; they are still very close friends). Now she is with me and I am positive we are very much in love with each other. We've been together for 3 months, and yesterday we had a conversation about our long-term future and she said that she can see us spending the rest of our lives together, but that she isn't sure about it like she was with her ex. 

I'm feeling bad that she felt sure she would spend the rest of her life with her ex after 3 months but isn't as sure about it with me. I try to tell myself that she knew her ex intimately for a full year before dating her so it's different, but it's still stuck in my head that maybe she had a stronger relationship with her than she does with me. The other factor that might be relevant here is that her relationship with her ex was her first serious relationship. Normally I wouldn't feel bad about this because it's only been 3 months and very few people are ready for that type of commitment after such a short amount of time, but apparently she was with her ex. How do I get over this?

Can you condense the text into three sentences or less?
<bot>: Feel bad that gf isn't at the stage in our relationship where she feels like we're going to spend the rest of our lives together, but did feel that way with her ex at about the same time.