I'm so sorry about all this. You shouldn't be obligated to see him just bcoz he suddenly has a fit of concience or bcoz your mom said so. Where does your wellbeing fit into this picture? I'm sorry, it just upsets me, my daughter has made it clear she wants nothing to do with her 'father', as young as she is, I've respected her wishes bcoz I saw how his presence upsets her, how she's reminded that he's nothing like her doting uncles, how all those broken promises and forgotten birthdays resurface. I'd never do that to her... (she also HAD a part-time dad). I say if you WANT to see him, give it a chance. If you don't, you don't have to,you certainly don't owe the man anything.
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Take care. Lots of ss to you.