<human>: I went through a lot of problems with my ex before we broke up - I pretended to like him more than I really did, a) to make him happier, and b) because he was pressuring me into a relationship.

 All of that is over now, but I'm trying my hardest to not lead him on. The problem with this, though, is that he wants more than I am willing or able to give and, intentionally or not, makes me feel guilty about not giving him what he wants. He wants to spend more time with me, but I'm naturally introverted and I need a lot of alone time. He also wants me to care more about our relationship. 

When we broke up, though, months went by without us spending time together, and I was very happy during that time. It's hard to bring myself to care a lot about a relationship that is damaging. I've known him for about three years. He is extremely stubborn, and needs extensive explanations for every decision I make in our friendship. We've argued about my lack of caring many times, but I've stood my ground and he always comes back wanting to be friends. We've agreed to hang out less since I feel guilty for not liking him as much as he likes me. But it still eats at me for ridiculous amounts of time each day and takes up a lot of my energy. My mood usually directly depends upon his. I've exhausted every other resource I could think of for advice. Reddit, what should I do?

Condense the text into a few key points
<bot>: My ex and guy-friend wants me to care more about our friendship than I am able to; this friendship is mentally exhausting for me much of the time.