If you are filing MFS you do not get an education credit/deduction for student loan interest paid---if that is the 1098 you are referring to. Is it a 1098E for student loan interest? If it is a 1098T you will not get education credit for that either since you are filing MFS.
And....you say you are using standard deduction, so entering a 1098 for mortgage interest will have no effect.
The 1099INT is taxable income so either one of you can enter it or split it 50-50 between you if you want to.
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