Fear in a relationship often oppresses both people within it. It is more likely to drive people apart then together. Love is a gift. A gift is only a gift if it is freely received. We need to remember that there is enough love for everyone.
You cannot force someone to love and care for you, or to stay in the relationship, you can only tell them what you need and ask for what you want.
While it is reasonable to ask your partner for support in the area that you feel insecure about, it is not appropriate to expect a lifelong agreement that is based primarily on unresolved fears and unhealed wounds from previous relationships.
When we rely completely on our partner for all of our relational needs, we risk overburdening our partners and asking for things that they may not possess. No one other person will be able to meet every one of those needs and if we are unwilling to look elsewhere to have them filled than we risk malnourishment in whatever area is lacking. The results of this, at an emotional level, varies from bitterness to depression, from anxiety to anger.