Whether or not you are entitled to spousal support will depend on several factors, including the roles that you and your partner each took on during the relationship. If you are not currently employed, your ability to earn income and become self supporting will be examined. A difference in incomes does not automatically result in an entitlement to spousal support.
If it is established that you are entitled to spousal support, the amount and duration of support is then determined. The Spousal Support Advisory Guidelines are generally used to calculate a range for the amount and duration of support. Where you fall on both ranges is determined by your specific situation. The Guidelines take into account several factors including each spouse’s income, your ages, the length of your relationship and whether there are children for which child support is payable. Depending on your situation spousal support may be time limited or reviewed after a specific event or set period of time.
I suggest you contact a lawyer for legal advice regarding your potential claim in order to obtain an opinion based on your specific circumstances.