Falling deep with someone who I’m casual with ahhh

This guy and I been talking hanging out , sleeping together . We do have a good time he has a daughter and he’s sweet to me. I have a son and it doesn’t seem to bother him. He just ask for my Venmo because he foundout it’s my son bday today . He sent me $200 and said “ buy him a toy/cake or whatever he wants to buy”. Sorry but little things you guys🥺 my son bio dad hasn’t said happy bday . I guess I’m falling too hard