I haven't voted because I think there is a third option.
I think your feelings are pretty normal as a mother of a toddler. Your partner become a close friend instead of your lover.
Do not get married, do talk to your boyfriend.
Take time for each other, time to reconnect and rediscover what you had. Date nights, weekend away, time away from your child, and time together as a family.
Relationships take a heavy battering when kids arrive. Some survive and some don't, but you need to give it a chance, by putting some serious time into it, before you give up.
I would also spend time on finding yourself again, whether through work, or friendships or just having some time out.
I would also suggets couple counselling.
This can be really effective. It doesn't mean that you will necessarily fall back in love or that the relationship will continue, but it is really helpful in establishing communication and understanding for the future.
I guess for me, one key question is how did you feel before you had the baby? Is this all post baby or were you already feeling this way?
So my third option is give it one last shot before you decide it is over.