Is it normal for a boyfriend to seem so simple?

Maybe you're the problem. Some people can turn any conversations into an argument.

He sounds like a man who has had enough, and just wants a quiet simple life.

I express myself by sneaking up on my girlfriend and blowing my load in her face.

I think that's a shame because I think most people would struggle to be in a relationship with someone who could not express themselves. If he's a good person I hope you find a way to cope with that, but it's understandable if you can't because I know I couldn't.

Your boyfriend could be like me.

Please don't think we are cold hearted assholes but the fact we lack the means to express ourselves or relate ourselves to certain situations.

I often find myself struggle with situations where etiquette dictates that empathy should be expressed. I do want to express empathy with someone who needs it but I lack the "expressive" vocabulary to express myself.

Sometimes I would just stand there and nod like a dickhead because I go into this brain freeze where it overworks and tries to conjure up something suitable to say. It has backfired where I come out with a one liner that seems comes across as sarcastic or showing lack of interest which is totally not true.

This is a personality trait. It's not wrong; it's just him. He may not be right for you because you feel unsatisfied conversationally. Not all guys are like this. My boyfriend is the talker in our relationship, so it's reverse of what people expect.

Read some books on personality, like The Color Code by Hartman. You can find out which personality to watch for to complement your own.

kick him in the sack.

There are those that express their feelings verbally and there are those who do not.
It takes years of patience to get those who do not easily open up to do so.
I guess the next step is up to you.

How did this guy hit you up? Conversation is men's biggest hurdle with women.

Do you actually love him?

Whoa.

It may be hard to hold a conversation with him but what matters most is that he's a good guy.

I think a lot of guys are this way. It's almost as if society expects the typical guy to be like that. I, however, am not that way and wish I was. But to answer your question, I think it's common, so normal.