Thank you very much for all the replies. Thank you!

I'm letting all the advice simmer and will probably decide how to approach - or not approach at all soon.

Most of you focused on her past bothering me. It did. But not as much as the reality that she's in touch with him.

I mean. 6 months... It's not a very long time, and for somehow if she still has feelings for someone else and she's hiding it from me, I should reconsider this relationship.

I would understand and give time to someone who just broke up and trying to get over a long-term ex.

But I just can't accept if I'm her "man" on the paper but she's secretly still thinking about a random guy who just slept with her in and out for 5 years - not even wined and dined once.

Sorry for being old-fashioned.