K.F.
If you are looking for trouble you will eventually find what you are looking for. Either you trust him or you don't. If you trust him cultivate your relationship with him while working on your self confidence. If you don't trust him, figure out if your lack of trust is from him or if it is in you. Lack of trust is only 1 of the death rings for a relationship.
I don't think this really has to do with your being hormonal but more to do with how you are thinking. Master your thought life. Especially if there are no grounds to believe he has been unfaithful. In other words Get a grip.
My mother taught me that you really don't want to be with someone others reject. She also went on to teach that the man is with you because he chooses to be with you and that matters. It really does have more weight and gives you the upper hand no matter who may come creeping out of the past. Also have convidence in knowing the kind of man you are with.