Relationships during pregnancy

So me nd my were together on and off for 7 years we have a almost 5 year old and a new baby due in april he cheated alot the reason the on and off right after i found out he cheated and after i discoveredi was pregnant the 2nd time we broke up he knew i was pregnant i hooked up with a childhood friend since then i tried makeing our family worj with my ex but i have feeling for the other guy we still right letters i havent told him my feelings but he told me hinting he does what should i do im conflicted