<human>: We used to work together a couple of years ago and were very close friends who shared everything with each other. He was one of the few people I felt comfortable opening up to. A few months ago, after nearly 2 years of not seeing each other he came in to my workplace and later that night spent about an hour and a half on the phone just talking about common interests and everything that's been going on in our lives. I forgot just how much I missed him as that was the greatest conversation I've had in a long time with anyone. We made plans, but never were able to go through with them so we just stopped speaking again.

Anyways, today after ages of not seeing him, he came into my workplace and we talked for 20 minutes or so which reminded me of just how much I missed having him in my life. He told me I hadn't changed at all. He asked me if I was still seeing my boyfriend and I told him I was. I asked him where he's living and he told me he got a place with his girlfriend, and told me that she's great etc.

Anyways, like I said it reminded me of how much I miss having friends like him in my life. The issue is, we both had feelings for each other when we were working together years ago. Nothing ever happened between us as we only told each other afterwards.

Anyways, I was hoping he and I could go out for coffee or play videogames (as friends ofc) but I'm not sure if that's inappropriate considering we're in relationships.

Can you give me a shortened version of the text?
<bot>: saw my old coworker today (both used to have feelings for each other but nothing happened), would it be inappropriate to ask him to hang out if we're both in serious relationships?