Advice! (Long story short)

So I’m coming here cause I have no one to turn to in this situation I was with my ex for almost 2 years but we’ve had history for many more years we broke up cause of fighting about other people and jealousy issues from past relationships. I love this man with all my heart and we have seen or slept with other people since we split but still continued to see and sleep with one another we were both in the wrong for that but I slowly started to move on and distance myself from the situation. He was stalking me on social media and calling me through out the night and eventually showed up at my house he’s basically ruined all my relationships since we broke up so I never really had the chance to get into one. He now has a kid on the way with a girl and he’s still doing all this stuff and I told him to quit cause it was making me miserable but now I kinda miss him I know it’s wrong but I have loved this man since I was 16 years old we both left relationships to be together but now I’m lost we seen one another about a month ago and things happened and I’ve missed my period so I could be pregnant but he has a kid on the way with someone else and they are dating I know once again I’m in the wrong for doing this but she does know and has dropped him off to my house too many times to count so am I really in the wrong? Is he only with her because he can’t be with me? I don’t know what to do and need advice!? he know I still love him and he’s told me the same every time he sees me! Help!???