• stop masturbating for a bit like 1 or 2 week see if it change. The masturbating can make you loss '' hunger'' for sex and even sensibility in your penis.

• sex is physical you want to spare your energy to not have to focus on your breath and more on the excitement of the moment to keep a hard on.

So don't go 100% all the time. Make her start to work first ( she can start on top of you by example) When you switching position she can give you an head ( to maintain your form) Don't not be afraid to ask her to stop moving to regroup your force or breath, to move slowly, or to move alone.

You do not want to be tired because it lead to you loosing your hard on.

• one trick when you lose it is to stay inside, do not go out. As soon as you got a semi hard on you can move slowly to try to reactivate your thing. During the wait take bake your breath, energy, Kiss her, she can touch herself with you inside, trust me it s great even if your not hard.

Sometimes I can take like 3 to 5 minute to get back like that, but a least I don't cut the action, I can continue after and it easier than trying to jerk off outside, get a hard one and get back inside while my GF is waiting.

• another thing, similar to the other post, you can have sex with a semi hard on. So even if your feeling you loosing it, don't stop. Just slow down and wait for another rush blood, your goal is to stay inside when you are hard it's easy, when you ve got a semi hard on you just want to stay inside. And compensate by touch, kiss, and her touching herself.

If she ask more play the card of controlling the action it will even turn you on if she s in the flow.

• there is also a big mental part, a vicious circle that you need to break.

An good way is to build up confidence by having more little session. You can go 100% but very quick and more often.

The more you will do it the better you will feel.

And like the hunger I was talking at first , if you have more little session maybe it will make it less complicate to satisfy her in one go.

• again concerning the physical part, its very impactful when your not in full potential like you seems.

Don't be stressed : that mean you have to avoid doing it like when you coming of a very hard work day

Be rested : maybe try the morning.

Do you drink? it can help for the stress but it can really make it impossible to maintain a hard on.

So you smoke? Don't do it before you need to be able to breath and perform like you were gonna have a run.

• for the final and most important part your GF.

First you should not accept the way she threatened you, she has to apologize you should be the one upset.

Imagine if it was her having a problem would you have the audacity to tell her that you are gonna fucks another girl if she doesn't do as good as you want.

It's not debatable she has to apologize its a big mistake.

The another thing, for sex communication is the key, you have to speak about it and she can be your greatest ally she is willing to help. But you have to talk about it.

This what I did, by the way she dressed, by the way we tried to mix up thing and try little trick in bed my GF helped me to build my confidence and my knowledge of what to do to please her and how to manage a weak time in bed.

You have to do the same, talk and find ways, to be better in bed, but she have to understand that she is essential for that. your don't have so deal alone with your problem.

Even her reaction I can understand it maybe she is upset because she feel that you not being hard is because she is not pretty enough or in this line.

You need a mature conversation about all of that.

Good luck!