Time really doesn’t matters, character of a person does.
Timestamp of a relationship doesn't really matter in comparison to the character of your partner. You can be with someone for, say, two years long and they can still make you feel so miserable about yourself, whereas you can be with someone for just two months and they can make you feel like you're their whole world and you matter to them like no one else. But the question comes down to only one thing, whether this two months person is their real self or not