Am I Completely Overreacting??

Please help me sort this out! There is a professional that visits our community every 6 months or so to do field work. My husband's hobby and passion is part of this field work and he is always invited to tag along and help where needed. This makes him happy and myself happy cause he's able to do something he loves. In the past, I have expressed that I would be interested in tagging along and helping or just observing and learning about this particular thing. He's said, "I don't think you can go" or "it would be weird to ask" or "we're just working". The times that he goes takes away from "us" time, which is okay but I thought this would kill 2 birds with one stone. We would be together and I could see him in action; because I'm so proud of him. Well, all this time, I thought I wasn't allowed to go and then I see a comment on Facebook in which someone else said they had a good time on their walk and doing this particular thing. I showed my husband and said, "wow, they can go but I can't"? Then he said, "I didn't know you wanted to go". WHAT?!? Then he said, "I thought you would be afraid". Again, WHAT? Because I've expressed many times I wanted to go. To me, he just lied to my face and I blew up. If you don't want me to go, that's fine, just be a fucking big boy and say so. Then he's like, "no, that's not it, I do want you to go, I will ask him when he comes back (in 2 weeks)". I don't want to go now because I feel he doesn't want me to go. That's stupid. So, he's tried to apologize but he's not apologizing for lying but rather not asking him in the first place. I think he needs to apologize for not asking him and for lying to me. Am I wrong? If I am, I will apologize to him.

EDIT: I honestly wouldn't be mad at him if he told me he wanted to do this alone. That part is okay. But he never asked, he lied about it. He is saying he was scared to ask. And HE is the one that makes a big deal of us spending our days off together. But with this, it's weird. I just want people to be completely honest and blunt with me.