Social Security is NOT a benefit based upon financial need. It is immaterial whether or not you are married. Your resources, your marital status and your living arrangements are immaterial.
When you became entitled to social security benefits you received an award letter. You should have read it. It told you what you need to report. Getting married isn't on the list. HOWEVER, your monthly benefit is so low that if you got married you would probably be entitled to additional benefits as a wife. To receive as a wife you must be married for one full year.
Even if you were getting a widow's benefit, remarriage at age 60 or later would not terminate that benefit.
If you get SSI (supplemental security income) instead of social security then you must report your marriage. His income will reduce or eliminate the SSI benefit but, on the plus side, a wife's benefit would probably be greater than what you are getting if on SSI. Unfortunately you must be married for one full year before you can receive a wife's benefit.
I was a SS claims rep for 32 yrs.