I think anyone who is having that many sexual partners is insecure and looking for something (no pun intended!).
This isn't about him being gay either. It's like reserve discrimination to hear he's been with 200 people and the first thing people say "oh he's gay". Like all gay people are supposed to have that many partners. This sort of stuff makes the gay community look bad as its re-enforcing negative stereotypes.
I can't imagine anyone having so many partners. I mean even if there was no sex involved with any of them, if they were all 'relationships', to be moving around that many people (whether gay or straight).. something is wrong somewhere. That's not a judgement I'm making about his lifestyle, but it's something he needs to work out.