Is it my fault?

[Cobalt]

Not sure if this has been said but, don't ever feel like you're responsible for someone else's actions. If he already felt like he wanted out of the relationship like he told you then I can't see how this is your fault. Now, if you were constantly flirting with him, spreading lies about his boyfriend claiming he cheated or what have you, and kept trying to get him to leave his boyfriend and get with you then yeah, that should sit on your conscious. But in my opinion, you didn't do anything wrong. You talked with him and offered advice, what he went and did after the fact is entirely his responsibility.