You mean she went with you to checkup already in SG ?
Or she told you went to checkup in JP ?
If you cannot forget the sms and calls, then don't, just learn to
deal with it.
Since you cannot make yourself happy, then at least learn to make
her happy by not dwelling too much into her past.
Sometimes, seeing the person you love happy , makes one
happy.
No you are not thinking too much.
You are just being cautious. There is nothing wrong with being
cautious, because you don't want to get hurt.
Before you commit yourself into a long term relationship.
You need to scrutinize the person in question, don't go in
blindly.
Although, most people do plunge headlong into a relationship in the
name of love. Very romantic right ? Not really.
When the big fights won't stop, and the heartache threatens to rip
your sanity to pieces, they'd start wondering.." Did I chose the
right one?" or "Was this a big mistake ?".
In other words, by being prudent and weighing the pros and cons,
you are taking a calculated risk. Especially when so much is at
stake.