Need some help

Me and my boyfriend of 7 1/2 years broke up and we have a 16 month old son. He broke up with me because I went into his phone and saw that he had lied about who he went to have lunch with, he told me it was a guy friend in reality it was a women, I talked to this girl and she told me it was just a lunch nothing else happend and she even regreted it..and he was mad because I did that and broke up with me…now he told me he wants to try to work things out but I have a hard time trusting him and I keep pulling away…we have been sleeping together and I know thats a no no, because I feel thats all he wants, he has not shown me hes changed, he has not takin me out, he shows up at my house late at night, and I recently found out he purchased flowers for someone…I love this guy with all of my heart and he tells me he still loves me to, but I cant seem to get over him…he told me if I started dating he wanted me to give my son to him because he doesnt want anyone else taking care of him…im trying hard to get over him but everything around me, reminds me of him…can you please help me