All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
Since Allaah blessed you with a man who has these good qualities which you mentioned about him, then this is a great bounty for which you should be grateful to Allaah with your heart, tongue and limbs. Indeed, there are many other women who are married to men who have bad moral conduct and their life with them is miserable. Therefore, remembering such a bounty may comfort your heart and help you be patient over what you may dislike about your husband.
As regards sexual intercourse, then the most preponderant opinion of the scholars is that this depends on the desire of the wife and the ability of the husband and it is not specified by a given period of time. We think that you may agree with your husband about this matter and he should understand your need and satisfy your desires and he should endeavour to achieve this for you. On the other hand, you should understand his situation as there might be something which prevents him from having sexual intercourse sometimes due to his health condition and the like. For more benefit, please refer to Fataawa 87619 and 89569.
However, it is not permissible for you to accuse your husband of being married to another wife without evidence. For more benefit, please refer to Fatwa 89109.
Allaah Knows best.