I agree with Chatterbug that you need to "Fake it till you Make it". I know it's hard.. but the more you fake.. the sooner it will turn real for you...
..which will help with your situation. IMO - it's not that what you are doing isn't working because your H refuses to listen. It's only not working if it isn't helping you figure out your next steps.
I know it sukks, but healthy people respect boundaries. Loving people respect boundaries... because they care enough about the other person.
I'm not saying your H doesn't care about you, but I do think his mind is only thinking about himself. Even if he is making it about you... it's not...
... because if he was.. he would be respecting your wishes.
Until he can shift his focus.. there isn't much you can do.. except to validate his feelings (which isn't saying he is right) and not reacting in a negative way.
But I don't think it's time to switch "tactics". You've only been doing this a couple weeks. Give it time and continue to stay focused that the boundaries aren't about HIM, but for YOU.
Remember that it's because you love yourself that you are setting them.
Remember that you are asking for space because you DO love your H and your marriage.
Be Kind and Loving.. but firm.
((( )))
M(f): 40 D'ed: 8/12
Show empathy when there's pain. Show grace when warranted. Kindness in the midst of anger. Faith in the face of fear.