No need to go up the wall, I'd suggest
First of all, ask yourself a serious question: is the relationship worth saving? In other words, do you think you love your boyfriend, and does he love you? If not, respect yourself and walk away. That's because delayed ejaculation is sometimes a symptom of a lack of intimacy, and if the problem for that lies on his side rather than yours you might find it's not easy to change him. (think about it - how much more intimate do you get than having someone who loves you ejaculate during sex inside your vagina?)
If you do want to stay in the relationship then you need to get the right treatment method. There are several of these, the most common being sensate focus, although my boyfriend and I cured the problem by using Tantric sexual techniques. What I suggest you do is research 2 things on the Internet: sensate focus techniques, and how to cure delayed ejaculation. That way should get all the information you need. The point being, your boyfriend needs to be much more aroused so he can ejaculate during sex.
The cure for delayed ejaculation is actually really simple - a hot, intimate, sweaty, physical, orgasmic, relationship with a real person whose heart is open to you, and to whom your heart is open. Frankly, without real communication and genuine intimacy, this is a problem that's not easy to solve. With those things, delayed ejaculation serves as a catalyst for a better relationship, much more intimacy, and fantastic sex.