My (20M) gf (20F) is telling me that she misses when our relationship when it first started and it's really taking a toll on our relationship. How do I bring this up?

If you're over 20 and you've never been in a relationship before, how has that effected you? : r/lonely

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My girlfriend misses her ex-boyfriend. She told me that she loves me, but nowadays she thinks a lot about him. What should I do? - Quora

What does it mean when a girl says she misses you? Does she want you back or is she just trying to keep you as a friend? - Quora