<human>: Give me a shortened version of the text

I'm terrible at reading social cues. So here's the situation, let me know what's happening here. 
I've been dating this fellow (me late 20s him early 30s ) for 6 months. Its been great, quite casual, more of a friends with benefits. 
We go camping, cook eachother dinner, watch movies, lots of great sex, ect. Excellent fun and lots of laughs all the time. He's always a pure gentleman and thanks me for good times the day after being together and is generally very polite and caring. 

He's incredibly busy so we don't see eachother very often. And for the past 2 weeks we have been apart on separate vacations, now we're both in town again but he's avoiding me completely. We saw eachother once in the 2 week period when I drove him to the airport and we haven't been in touch since.

I've sent him a text and an email with nothing more than an impersonal hello and that's it. We've never established a relationship, but what I'm wondering is if he's just over me and I should walk away, or should I keep trying to get together?

Previous to the 2 week halt we communicated almost every day and saw eachother on weekends with sleepovers all the time. Right before the 2 weeks he still saw me but would be too busy for sexy time. Now I'm getting nothing.

This also happened at the very beginning of our courtship, we dated for about a week or two, then he completely disappeared for a month, then came back all of a sudden and really dove into the dating thing with me. I never asked about what happened for that month.

I'm pretty sure I've answered my own question here and am pretty sure I need to find a new fwb. Am I correct?

Sincerely, Totally confused by dudes.
<bot>: After 6 months of dating he has started ignoring my attempts at seeing him / having sex.  Is it worth still trying or should I just assume he's not into me anymore