Resident Evil 4 is such a special game in many ways but one of the less known things about this game is that there is a love story building that started off when both characters were in the game (Resident Evil 2) this builds by having them further trust each other by having more time together and saving each other again but people still don't know if Ada is only getting closer with Leon to get closer to getting something she wants or because she loves him. It's one of the most complicated relationships in video games I personally think due to there being so many different opinions and takes depending who you ask.
Ashley wanted Leon at the end of the game because Leon saved Ashley from the castle, during the final cutscene of the game you can see Leon and Ashley ride off on a jetski together and Ashley says "why don't you visit me when you have the chane" Leon does not want to visit so he does not say anything back to Ashley.
Resident evil 4 is rated one of the best games of all time, this game made third person action shooters change for the better. without resident evil 4 there would not be many games great like this today. The developers (Capcom) have done a really good job at creating this game by the storytelling, controls and lovable characters. This game deserves the rating and it still holds up to this day as you can play it and still have the same amount of fun back when you did in 2004.