Quiet down the voice of jealousy

Whenever that voice inside tells you that you're not good enough, not as good as that other person, your partner will find something better: get it to lower levels by replacing it with another voice. Build up ideas for things that this positive voice will say over the top of the jealous voice. Remind yourself of that thing you did brilliantly and the wonderful things your partner has said about you and why you're worthy of him. Eventually, before the jealous voice even speaks, all you'll hear is the positive one! It works!