There is a middle ground between just the ceremony at the register office, and a lavish do costing tens of thousands.
And most weddings fall in there, somewhere along the middle gound.
We've had a few weddings in the family in the last 2-3 years. Full of family and friends, not massive expensive occasions, but we had a good time. Very little went up on SM, the days were all about celebrating with the couple. (And I know one of the fathers well, always has an eye for a bargain, can guarantee the wedding wasn't a massive expense.)
That your DP isn't willing to compromise, or even talk about it, strikes me as a red flag. As did the comment about you emotionally blackmailing him when you tried to talk. I don't think there was any emotional blackmail from you, unless you were trying to browbeat him into said lavish wedding. And I'm not getting that vibe from you.
That he isn't interested in the idea of spending money on a holiday for the DC isn't good either. He wants everything his own way and isn't bothered about your feelings.
OP, I think you need to take some time to see if this relationship is right for you. You say you discuss all joint purchases, etc, but who actually gets what they want from these discussions? Has your DP ever changed his mind and agreed with your POV? On these discussions, or anything, really? Are you the one doing all the compromising?
I ask these questions not to get an answer myself, but to give you things to think about.