Why would my boyfriend get upset when I asked him whether or not he took cyalis?

I disagree with the other sentiment to some extent, I have been in a few relationships earlier in my life the foundations of which where not bounded on truth. its a spiral downwards as you are never certain what you have or have not told the other person, and like most thinks it eats away at the relationship. In my view a relationship is bound first and foremost on honest, and from what you have described his whole life seems to be a secret not just the ED part. There can only be 2 reasons for this, he is so worried what you might think of certain things and is worried about losing you, or is actually ok, and what's to keep his life a secret. in both cases your the one who looses out. You need to confront the problem, which is communication, and that you need to work on it.

It would be sad if you are stuck in a relationship not knowing what do believe anymore, just for myself, I don't think its worth it, but I am speaking from a world of hurt as I have been in your shoes in this case.

Knowing that you need to take something for ED is bad as it is. Having others know that you take it is even worse.

He was wrong to have jumped all over you but doesn't surprise me as an initial reaction to having something private and embarrassing discovered. You questioned his manliness and that will always get a negative response.

Did you overstep your bounds? In this case, probably yes. But I have no idea why you asked him that.

when it comes to the "little general", we prefer to keep things to ourselves.if he's taking steriods,
he may really have problems in the intimacy department, and genuinely need the Cialis.
Steriods can really mess with a guys mood, and make him violent too, just in case ya didn't know.
It seems to me, that this relationship is doomed.wheres the romance, trust. there does need to be some space in relationship, and people should have there secerets too , if they feel it necessary.
So yeah, avoid comments on cialis.chances are, he's disappointed that he's not working "down there" and has to resort to back-up. Give each other a little space.

He got upset because needing a drug for ED is embarrassing for any guy. Its something that you may need and he does it so he can please you, but he doesn't want to talk about it.

the average educated person on the planet will tell you that steriods cause all sorts of damage to the body AND the MIND.
he need help and fast, his temper tantrums are just futher proof how far gone he is.
but.just to be fair, you are only his girlfriend, not his wife, his financial afairs are his BIZ, not yours. who CARES besides YOU wether or not he is broke, are you marrying him for his money? or his muscules? it sure can't be fore his steriod abused personality!