It's life Gym, but not as we know it

Buzz Lightweight has got a new obsession, he now treats his body as a temple and has joined the on-site gym .He goes 3 times a week. In order to change himself into Buff Lightweight, Buzz has become a gym bunny.
The only problem with this is that he keeps disappearing to the gym, without telling anyone, when he should be working.
I can't go into much detail because it's a work thing but it reached a head last week when he came back from the gym and then sat on his arse for 3/4 of an hour when there was work outstanding.
I had a go at him, in the printroom, out loud, in front of everyone.
He said "hold on, lets have this conversation in private" I was on a roll, I said "no" and carried on listing his faults.
A bit later on he confronted me for round 2, I offered him a compromise which he thought was fair and far as I was concerned the issue was dealt with and closed. Buzz apparently thought different.
Buzz has some difficulties in his home life and he said that going to the gym helped him to relieve the stress he had been under. This is fair enough and I'm glad I don't have the same problems he has got but I just felt that in a close working enviroment you have got to be flexible and work with a bit of give and take and he was taking too much. Going to the gym is not something that I would do during the working day, even if I did claim it was my lunchbreak.
He called me aside on wednesday and stated that he had thought I went way over the top and it was so unfair and nobody likes me ,everybody hates me, I'm going to go and eat worms. He also took the opportunity to kindly remind me that my role in the site as unofficial lead engineer does not mean I'm in charge and that I'm just the same as him (I wanted to say "I am not the same as you!", but I bit my tongue and held it in) and that I am just a liason for the client.
I'm not sure if he was expecting an apology or not but he didn't get one.
Yesterday I arrive at work on late shift to be told by Cap'n Bob that Buzz has gone sick and once again his wife phoned in for him. This is, I think, the 5th time he has been off sick in the 18 months that he has worked here. In early February I had one and a half days off sick, this was the first sick time I have had for at least 3 years.

Buzz repairing a copier earlier in the week

He was off again today which means he won't be in tomorrow for the overtime he was so desperate for when he came here.