You need to think about how your feeling about all this, are you able to accept that there will be no full on commitment from this guy towards you at this point ?
Im kind of in the same situation as you right now, so i can kind of relate, and i know its hard, ive thought of ending things myself, but this is hard too.
Your gut instincts are telling you you should, but your heart doesn't want to.
Putting this chart to one side, your wanting a proper relationship with this guy, he's saying he's not ready for the reasons he says, this in turn makes you paranoid that he's just making excuses and is just using you, you are then trying your hardest to accept it for what it is, and carry on even though your hurting in the process as you want more.
You say your exclusively dating, has he told you he loves you ?
And when he says "he's not ready because of past trauma and he hasn't found his life purpose", if you have a girl you love and see a future with, then shouldn't he be wanting to find his lifes purpose with you ?
And planning to leave too, he should be asking you to go with him.
I know your in a difficult situation, but what about if you carry on seeing him, and then months down the line he says he's going "to find his lifes purpose" where does this leave you ? Your left to pick yourself back up.
I think you need to have a serious talk with him, and tell him how this situation is making you feel.