My six year old's girlfriend

It's official son 1 has a girlfriend, he had playdate with her on Friday. It all started a few weeks before the end of term, I was sorting out his school book bag and saw a lovely picture which I was just about to put it on the fridge when he told me it was from Rachel at school. I turned it over and it was a love letter (ah so sweet). She's a lovely little blonde thing whose not one of the popular girls in his year so I thought I would boost her future self-esteem as I'm not boosting but my son is gorgeous! That night, we had a chat about Rachel and I suggested that he asked her to be his girlfriend. He thought this was a good idea but then I asked what he was going to do about the 'girl next door' who has always been his 'girlfriend'. He then pondered this in that way that boys / men do. The next evening I asked if he'd spoken to Rachel, he said yes and that she had responded with the message that she knew he would eventually be his girlfriend. I like her confidence, maybe she didn't need my help with her self-esteem. Her mum then organised a playdate for them, don't worry its all v.innocence. Do you think he'll appreciate my suggestions for girlfriends when he's older???