I gave my depressed friend some head and now I feel guilty?

Long story short he's going through some Real tough times. He lost his job, needed to sell his car, girlfriend broke up with him about 1 month ago.
I've always been a good friend to him, and always liked to make him happy. One night he was just telling about how depressed he is and i felt so sad when he started to get tears in his eyes. I told him chin up, I can make him happy. So without hesitating i made him comfortable, gave him oral and even swallowed since i know guys like that.

Now i feel like a terrible friend. I feel so guilty because i feel like i invaded him. he's my friend, not some sex object and that's how i think of it now. Was it wrong for me to do this to him? :( I feel like a slut.

For the record i would never do this to anyone else. Only him.
I gave my depressed friend some head and now I feel guilty?
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