OP, in some respects I do feel for you because I have some experience of getting to know a once absent parent and all the attendant emotions it can evoke. Meeting a birth parent can really play havoc with your perception and feelings for quite a long time afterwards, it can be quite a dangerous time in some ways, a bit like the first flush of love.
But even though I am sympathetic, I also think you have quite a romantic view of the 'specialness' of blood relationships and this is rather clouding your judgement with regard to your half-brother.
I am someone that has turned down the opportunity of meeting both my half-brother and my half-sister, both of whom have contacted me within the last five years, though at different times. If they had contacted me earlier it might have been different but I am in my thirties now and have already gone through the ultimately unsuccessful experience of meeting and trying to build a relationship with my biological father. After a number of quite painful experiences I realised that he is a narcissist and had caused untold damage to various partners and family members along the way. Once I realised this I cut contact and have lived in blissful estrangement from him ever since.
I don't want to have any contact with my half-siblings simply because I just don't want any more complications or emotional drama in my life. It isn't their fault and I'm sure they're lovely people but I just don't have the desire to meet them because I know that these relationships do not always end like a fairytale and that they take a lot of effort and thought on both sides to get right because you start from a basis of being complete strangers with no real shared experiences. They can also often very fraught, particularly if one sibling's experience of a parent is completely different to that of another sibling. For example, how would you feel if you found out that your brother had been spoilt rotten by your father, when you had been effectively ignored for years?
There was no magical blood bond with my father and I doubt there would be with my half siblings either, I personally think those bonds are forged more by growing up together and sharing your life with someone. I love my husband much more than all but one of my blood relatives to be honest, and we have a lot more in common than a lot of people I share my blood with.
If you love someone and you have a blood bond then I think that can be the strongest bond you can have with a person, but if there is no love then a blood bond means nothing, it's just a fact of nature. Neither does it obligate you to have a relationship with someone if you don't want to.
Whatever you do, I would seriously advise you not to push your half-brother into any meetings or relationship. You can indicate that you would like to meet him when he is ready, but I really wouldn't push it any further than that otherwise you run the risk of alienating him completely. My half-sister was particularly insensitive and pushy and it made me even more determined not to get involved.