I feel partly responsible for this situation but now I'm wondering how best to deal with it.
A few years ago DP and I got involved in a group hobby where we met a guy who was socially awkward and really quiet. I took him under my wing somewhat as I know from personal previous experience what it's like to be socially awkward, I knew a lot of people in the group and love making new people feel involved, and over time he became a bit more outgoing and loud, which was lovely, and I was glad he was coming out of his shell. However we were never really what I'd call 'friends' - we'd just see each other at this hobby and have a bit of a laugh, and that was that.
However, in recent months (since lockdown has lifted especially, and since we're meeting up more regularly again) he's particularly latched onto DP and me as we tend to organise a lot of the other social events for our closer friends in the group and he isn't seemingly taking the hint to back off a bit. I've had a girlfriend complain to me that he's been "creepy" towards her (over-familiar and flirting basically), and several of our friends are fed up of him because he tries too hard, wants to involve himself in absolutely every social opportunity he hears about even if he's not been invited, and is a bit much both over text and in person. He tends to message DP and me several times a week (and sometimes several times a day, like today) asking about what we are doing and can we meet up at the weekend etc. - he seems to be pinning a lot of his hopes for entertainment on us, which is becoming uncomfortable and smothering.
How do I best manage this? I find him irritating at the moment but I don't want to upset him by being too blunt, especially if he is still finding his feet socially. DP feels sorry for him and says he seems depressed, and wants to help, but he also gets a bit fed up at times. We both work hard so our free time and energy are quite limited and sometimes we are just too tired to put in the effort with his need for entertainment! AIBU and what can I do to resolve this? I've tried backing off by not being as responsive as usual but it just seems to be making him try even harder to become close, and it's making me feel really awkward.