Sticky Love Situation need opinions!!🙏🏽

Okay so My ex went to jail. I thought he'd be their for a couple of years didnt really think about giving him another chance till i seen that he has changed. But im now in love with someone else. & i just got done talkin to my ex saying he wants to see me monday he will be out😳 he was my first love and i cant resist him /: and the one im with now doesnt make me as happy as him... but has some better qualitys ugh i just dont know what to do i need help!