Whats the deal with him?

My fiance of 1.5 yrs and 7 month old baby daddy broke up with me 2.5 months ago...started dati8ng sumone and tellin her he loved her 5 days later. Well he started tellin me this past week he loves me and misses me and wishes he can change it all and go bak. He knows i love him and want him bak. But he still hasnt made a decision. He says hes gonna talk with his mom he needs advice but if he cares for me like he says he does then what the hells the deal? The reason we left me was he said he was unhappy just didnt know why. And i asked him whats different nowhe said noting. And hes been drinkin cuz hes sad to.