Welcome to PC

Being so invested in hanging out with one person all the time might be seen by them as suffocation. Yes they do care about you but they would possibly appreciate some space. Friendships need care and attention and time apart for them to flourish. Having you own hobbies and other friends will be good for you and most likely bring the ability for you to bring some freshness back to the first relationship. Have meals/coffee out with other people. Invite other people to go to the movies. Please try not to focus on one person. There are other good things to be had.