An interesting situation which is unlikely to result in a happy one, the shocking thing is that by your own admission you saw this coming. Still you persisted in the relationship, even to the point of becoming pregnant by him.
You don't even seem to have related the fact that having intercourse with him and becoming pregnant by him, is leaving it rather late in the day to decide whether he is suitable material for a permanent relationship.
It is customary to make such decisions and discoveries PRIOR to removing your knickers, Not afterwards.
Without wishing to cause any offence, I reluctantly must arrive at the conclusion that whilst your boyfriend may well be totally unsuitable material, you must certainly be seriously weak in the head.
Cannot see a way to a satisfactory conclusion.