<human>: hey folks! 
So like the title says, my boyfriend and I are considering an open relationship (my idea). He recently moved 20 hours away (drive) and we'll be seeing each other maybe once every 2 months until summer. 
He's been getting lonely as he's been leaving his whole life behind to attend university. 
So recently, we talked and he's telling me how he can't deal with the distance because he misses me too much and thinks he should be on his own to focus on himself because he feels trapped. We've been through this quite a few times when we don't see each other for long periods of time and break up for about 5 days and get back together. I think I know him well enough and chalked it up to him wanting sex more than he's getting and I suggested an open relationship to him. He was wary about it but it seemed to calm him down until he mentioned me being with someone else then he started say how he couldn't deal with that. 
Anyways, we talked a bit more and said we'd try experimenting a bit more with bringing a third party in bed with us first and then see where things lead with us since we're both VERY jealous individuals.

So what I'm asking is: is it a bad idea for me to have suggested an open relationship? Any people who have tried it out and it worked? Is it possible to have an open relationship with certain conditions (no emotional stuff with other people, sex is only off limits)? 
He's my best friend and we don't want to lose each other but I understand he has needs that I can't fulfill 1500km away. 
Thanks in advance everyone!

Give me a shortened version of the text
<bot>: Boyfriend felt trapped in our relationship until I suggested a temporary open relationship while he's away at school. Questioning if it was a good idea or not.