Say goodbye to this relationship and put it down to a learning experience. You will spend your life messing up relationships if that is the view you choose to take. Be mindful of your actions in relationships. Using your last relationship think about how you can approach things differently the next time you meet a potential life partner. And don't blame yourself for this, he said he was feeling pressured but he also said his feelings had changed. You don't have control over the latter but you can learn from the former.
Some people are drains and some are radiators... Keep clear of the drains and hug the radiators!