First of all - hooray! Well done you, it's a huge achievement and you have the right to be proud.
In answer to your q - I think it depends on the age of the baby. At first my partner was very supportive of my bfing and gave me a lot of help to get it started. However (probably quite rightly) after it was established it just became another part of our routine and he stopped giving me any particular pats on the back or support. I think he was pleased that I was doing it, and proud of me for persevering through difficulties in the early days, but I don't think he saw it as a massive achievement day-to-day, which (to be honest) after a while it wasn't.
So I think he was supportive in proportion to how difficult I found it - which is probably fair enough in my opinion.
Also it's difficult to remember to pat on the back. He did/does lots of things which I am proud about, like being a great dad, and giving me lie-ins now I am pregnant again, but I don't routinely tell him how wonderful he is. I might say "thank you" every now and again but often I take it as his part of the parenting role, just as I'm sure he takes breastfeeding to be my part of the parenting deal.
It is hard in the early days when the burden often falls unfairly hard on the mother's shoulders, especially if you are bfing, and I don't think men always appreciate the weird claustrophic hard work involved in looking after a small baby - but I don't think that's an intentional slight - just a reflection of the fact that without any experience of being in that situation it's often hard to imagine another person's trials.
You don't say whether you are still finding bfing difficult or if feeding is now going well...? Either way I think it's important to talk to your partner and help him understand any pressures you are under, to give him a chance to understand.
Phew, sorry this is such a long post!