I need help with my love life!!!?

a fella who i went with when i was younger behind my parents backs has told me he loves me and that he always has even though he is now in a relationship and has a baby. i told him i felt the same but i dont know what to do cause i dont want to be the reason he leaves his girlfriend and child although he says he only loves her cause of the baby. i dont no if its for cause ive never slept with him and wont untill hes single and told him this or should i so then hel leave her. my friends no how we feel about each other and told me to go for it anyway but i want someone elses opinion who doesnt know us