I swear if I didnt love her

If he's 48 then he should know better than to be pissed off at you.
Were things good between you before this?
What did her mom say?
What did your parents say?
Why is he so surprised or offended by this?

All of the suggestions on here are pretty good.
What you need to do is show up unannouced at his door drunk. Bang on the door with your fist screaming obscenities at him until he answers. Yell at him, push him around and shout him down until he's a babbling little boy in the corner crying for his mommy. Belittle him a bit more and give him a noogy for being such a baby. Make him give you his lunch money and kick him in the ***. Tell him it will be twice as worse next time if he doesn't get with the f'n program. Storm out of the house after taking all of his booze and urinate on the step on the way out.
You shouldn't have a problem with him bugging you anymore after this.

This is how he actually sees you, what you've done to his immaculate princess, and his reputation.
And this is what he did to you in his texts.
Screw the texting, it's too impersonal for what's going on here.
Face to face only after a couple of days when everyone has had a chance to cool down and you should be able to work it out. Choose your words wisely. Prove to him you are a man by not backing down from him and standing up for yourself and your actions, however, realize that this is a big step for him (and not an easy one at that) and give him the upper hand. He will probably respect you more after this. Give it some time.
If not totally resolved or he's calmed down at least after this, he sounds like an overbearing idiot that i would never tolerate especially if you get married to her. Nothing's too good for his princess, and he's got to get over that, it's his problem. He might be the type of person that nothing's good enough for him.
It's actually good you saw his true colors now instead of down the road more.
You've been going steady for 2 1/2 years and you waited until now to be intimate with her?
Wow, you ARE a patient man!
And if her father doesn't take that into consideration, than he's a real idiot.
Let us know what happens........