Here are three ways to increase the level of commitment in your relationship:
1. The key to commitment is to remove your dependence on your partner (and to help them remove their's on you). To do this you will need to develop your self-esteem.
2. Even if your partner is not committed at the moment, your increasing self-esteem will make you feel more committed to them. They will feel your open-heartedness and the love that you show them will remind them of their own self-love.
3. Eventually you will re-bond and fall back in love, at which point you will both feel much more committed to each other.