I'm gonig to give my standard real-life response that human beings are not biologically programmed for monogamy.
In addition to that, consider your emotional maturity level now to five years ago, think about the same for her, then compare to each other (you can do this just by thinking, it doesn't have to be discussed, because she will not interpret it as anything other than a pseudo-intellectual "It's not you, it's me" talk.) Once you think about it and realize that you're two completely different people now than you were in high school, you're probably going be less apprehensive about the possibility [IMO, the fact] that this relationship isn't going to last much longer.
If I were talking to a personal friend, I'd say exactly this: you had a great time, but it's over. You're drifting apart and it's inevitable. You have an opportunity to jump ship before this one goes down, and I suggest you take it.
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