What's the psychology behind his behavior?

I broke up with a guy who I dated on and off for 3-4 years after I figured out he was a chronic liar and cheater. I told him I no longer wanted to have anything to do with him, but he won't stop texting or calling me.

It's been 18 months, and he still texts ("hey", "how you doing", "can you talk to me") and calls me (but never leaves a message) almost every day even though I have not responded to him at all since I ended things. I've blocked him most of this time, but out of curiosity, I unblocked him just to see if he is still at it, and he is! I haven't seen or communicated with him for a year and half and he's still acting like everything is normal.

I blocked him again now, but I am just really curious -- what the hell is going on with this guy?

That is really bizarre - he still contacts you almost daily 18 months later???? I have no explanation. If it were once every month or two, it would be more understandable as a possible hook-up request.

It sounds to me that he could be interested in getting back together with you or he is finding it easier to pretend everything is alright instead of being able to move on (I have experienced delusions in the past and know what it feels like) or he could have developed a bad habit of stalking you - be cautious that he does not hurt you and if the situation escalates you could consider legal support. Do you still have feelings for him somewhat?

An unhealthy obsession/ failure to appreciate the reality of the situation.

He wants a relationship with you on some level, whether it is as lovers, friends or as enemies.

The never ending texts and calls are an attempt by him to provoke you into responding, which would signal the resumption of a dialogue (in his mind, anyway) and therefore the payoff he is seeking.

In a way, you are still in a relationship with him. Your curiosity keeps you doing the block-unblock-block shuffle.

Are the texts/calls the only way he is in your life? I'm getting a real "stalker" vibe from him.

Block him. Overall on again off again do not work. Relationship is either on or off

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I have mixed feelings about him, but I do not want to get back together due to him being a liar and cheater (and possibly a stalker). Not really the kind of guy I want for a long-term committed relationship...

He is not in my life in any other way - that I know of. We did used to run in the same circles, but I've kind of removed myself from them over the last year or so do to breaking up and other circumstances in my life.

I agree there is a stalker-like quality to him but a very odd or lazy one , since the texts and calls are the extent of his attempts to engage me (it's good though, b/c he isn't really a threat). Yes, I probably should block him for good and truly move on. Letting go of the past is one of the things I am working on.

for all the replies.

You have long way to go as you are only 18. Think properly and it is only you who has to take the decision, if he has negative habits I feel you should think before you proceed with him.