I think if he is really a great guy, there should be no issue with telling him. He shouldn't judge you for something that's in your past, especially since it sounds like you made the most responsible choice at the time. But, really, only you can decide whether or not to tell him.
I'm definitely not an expert with this type of thing, but I think that if you had no complications after the abortion it shouldn't cause any problems with future pregnancies. A lot of women miscarry early on in a pregnancy (like you did), so that may not necessarily be indicative of any sort of problem. But I think at this point talking to a doctor would be best. Tell him/her about your history and they can probably give you a good idea about whether you will have any issues. They may also give you tips for trying to conceive (e.g. finding out when you are ovulating). I think the only way you'll find out for sure whether you are able to conceive, though, is by trying.
I also don't think you should worry about not deserving a child. I am not trying to impose my beliefs, and I don't know all the details of your story, but it really sounds like you were making a responsible choice for yourself by avoiding having a child with a man you did not find suitable. Maybe you should talk to a counselor. You can call "Exhale" 1-866-439â4253 if you want to talk to someone (http://www.4exhale.org/). It's all confidential, and they don't try to impose any sort of beliefs or judgments on you.
Best of luck.
Also, here's some info on getting pregant:
http://www.americanpregnancy.org/gettingpr
egnant/