My girlfriend the "realist"

sictransit
So the other night my girlfriend and I watched Blue Valentine (Note: do not watch this movie with your significant other) and it sparked a conversation afterward about how fragile relationships are, and how most of them end. Her and I just got back together after 14 months of being broken up. We've now been together for almost 3 months, she knows I love her, and she finally just told me she loved me last week. I am definitely a romantic, and since we've been back together she's been calling herself a realist. So as we were discussing relationships, she mentioned how she thinks we likely have an expiry date, since most couples do, but she hopes we don't. I may be a romantic, but I know that there are no guarantees in life, I know that most relationships end and so every one of them is against heavy odds. I know all this. But when you're with someone, and you love them, are you not supposed to think it's forever? Even if in the back of your mind you acknowledge it probably won't be, are you supposed to think it is? And if you really do think that your relationship has an expiry date, are you supposed to say that out loud to you significant other? We haven't been back together that long, and since she is the one who broke up with me originally and absolutely broke my heart, getting back together with her has been difficult because I have had to learn to trust her again and to become secure in the relationship again. Needless to say, I was sensitive to these comments she was making, and they hurt and worried me. And she feels like I shouldn't have reacted that way. So what do you think? Is there logic in love? Can you be a realist and be in love? Are you supposed to think there is an expiry date with your significant other? Was I wrong for getting hurt and upset over these comments?
My girlfriend the "realist"
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