Why is he like this about my friends/family??????

My bf who I’ve been living with for 3 years has never hung out with my friends with me. I have hung out with his friends though. A lot. Now my best friend who I’ve been best friends with since I was 5 wants to go on a double date with her boyfriend and me and my man, and when I asked him if he wants to go he said “uhhhhhhhhhh... I’m gonna have to say no.” I could tell his mood was like ruined just by the thought of going. I didn’t even get a chance to tell him what we’d even be doing. I’m like why, we will have a good time, my friend and her bf are cool. He said bc he’ll be tired from work. Bullshit. After work he is always wanting to go do stuff with me.

We both forgot our 3 year anniversary, which was 2 days ago. So I told him, to make up for forgetting about our anniversary, I want you to come on the double date tomorrow because it would mean SO much to me. He would NOT look me in the eyes and said “ok” really weirdly. I made him look at me and promise me. So now I’m just waiting to hear his last minute excuse about how he has to work late or he’s too tired to go. We’ll see though... but I just don’t understand why he’s like this??? He acts like I’m asking him to go out and put a bullet in his head! He would like my best friend and her boyfriend, I know he would if he would give it a chance.

He also bails out of seeing my family every single time (not like there’s a lot of chances to see my family). He use to never bail and would come see them for my sake. My family loved him. Now he hasn’t seen my family in over a year. He promises he loves my family, they did nothing wrong, he just doesn’t like family time. Like he acts like he’s too “cool” for that now. Really pisses me off, when I see his family quite a bit. I’ve already told him many times how I feel about this.

He doesn’t have social anxiety, he is very outgoing with everyone. He says hi to people out on the street and stuff like that. Everybody always likes him. So I just don’t understand why he’s like this!? And how should I actually handle it? I’ve been very chill for the last 3 years but it’s starting to really be a disappointment for me and for the people close to me and I feel it’s just not normal and I’m getting embarrassed by this.