<human>: I am very confused. There is this guy I like, we'll call him Jack. Anyway, I think he likes me. I'm not sure. On one hand, he seems spacey and unenthused when he's around me. On the other hand, he's chill, talks to me, and jokes around. 

I was recently talking to a friend/roommate of his, we'll call him Dylan. I've met Dylan before, but when we exchanged names he said, "Oh! Yea I know of you, Jack talks a lot about you." Which very much threw me off, because I've invited Jack to hang out a few times before but he always makes a joke to walk around the invite or says he's busy, "...but we'll hang out real soon".

(To be specific, we're not close friends more acquaintances, and we're in the same major (which isn't a big class size). We've known each other for about 3 years through mutual classes, and we've hung out before in group and party settings. This is just to give you an idea of how we know each other.)

I'm not really sure how to handle this anymore. Should I just ask him out? I'm getting a lot of mixed signals, which I've never really gotten before, so I don't know what to do.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I've invited him to hang out, but he always says he's busy or jokes around it. I'm getting a lot of mixed signals. Any advice?