It sounds like he is not ready to be in a relationship, then.

Being in a relationship with you (or anyone, since he cannot trust another person) is a disservice to you and to your relationship.

If he does not work on himself, his insecurities may escalate (e.g. jealousy, controlling behaviour... or worse). At best, you will always feel the pain of not being loved enough because he is withholding a part of himself and his love from you. This is not a healthy partnership.