My husband can stay long time without making sex with me although he loves me & everything is okay between us why? he wasn't like this before 2 years

concerned: I would say everything is not okay between you two. People can avoid sex with their significant other for all kinds of reasons. You are right to be concerned. He may have some hidden reason such as he is angry at you, he may getting his desires met elsewhere, he may be gay and he may have developed a hormonal problem. Start by simply asking your husband what's going on. Then have full exam.

Need a frank talk!: Something is not being discussed out in the open. It may not be an affair but it is something. Perhaps he is having low testosterone or prostate problems or some other medical problems, perhaps something about how the way sex is done needs to be discussed? If it is too routine then maybe he's lost interest. It is sure to be an uncomfortable discussion but necessary if you want to get to the truth.

Many Factors: Many factors can be involved with an person's declining sexual interest. Stress at work, fatigue, and depression are all frequently related. Sometimes people get stuck and engage in repetitive sexual routines that become dull over time. Spicing things up may help, such as initiating sex in new way, trying new techniques, etc. If his low interest continues, getting a physical exam may be helpful.