Scorpio Ex attempting to reel me back in I think....advise/clarity needed!!?

Ok so I have this Scorpio ex that has been trying to get back in touch with me recently. We have been dealing with each other on/off since 2008 (I'm a Cancer). I still do love him genuinely and it seems that whenever we reunite, it is 10X mores passionate then it was the time before. I really need to get a handle on this situation because i feel like he is the only guy i allow to break all my rules, he is my exception. We have this like magnetism to one another that neither one of us can control. He had seen me for the first time just recently and the fire and passion in his eyes said a thousand words. We had lost contact for about 2 months because i had got a new phone and didnt give him the number (in a attempt to try to ween myself off of him). I bumped into his friend the other day and he made me aware that my ex had been mentioning me lately and had called him to stalk my facebook page to see what i had been up to, although i deactivated months ago. The thing is everytime he goes back into my life he tries to control everything and have it on his terms. He wants me all to himself and wants to give me wants he wants. For example, I want a committed relationship with him and he wants a baby to me. He says once i have a baby he will be able to fully trust me and i will be forever his and whatnot. I did have an abortion to him last year that he didnt find out about until it was over because i didnt want to live that life. I didnt want to feel like i was forced into this prisoner of life type of situation. He is extremely possessive, jealouse controlling, but what i dont understand is his need to have this baby so bad. I have been distancing myself as much as possible from opening that can of worms again because i am afraid of what hidden motivations he has. He has this crazy mentality that if he cant have me no one can and that once his always his. My love for him is strong, no doubt, however I dont want to cause myself more emotional detriment because my sanity relies on it. I have been through the ringer and back with him, we have gone through so much but it only seems to make our bond thicker and therefore harder to break. I dont know whats going on or what to do? Any insights are appreciated. Thanks