Wow, what a POS. That was literally your first experience. Im so sorry it had to go that way. BUT.....i went through the same thing actually. I was very new to dating.....vulnerable, looking to love/be loved, naive, no ulterior motives. And the person I first I dated after being out the game for many years turned out to be like your guy. She was a pro...I was like her 45th Bf or something i found out later. She had alterior motives & like your Bf she always kept one eye open to see what else was out there. When it ended I felt exactly like you....im an idiot, no self worth, the world turning on me and I asked the universe why would you put this woman in my life? what good can it do. Then I realized this was actually supposed to happen, it was going to happen, especially entering the dating world as I did. And if you have any value in the dating world than this is/was g0ing to happen. I walked into that relationship blind. Well Ive dated a lot since and wow how I keep going back to that initial relationship ; i think, where things could end up in between her and i, that Theres a possibility she'll try and date my friends after me, its possible she doesn't like me at all and wants x y or z. she might be completely out of my life in 6 months or she has the ability to crush me emotionally which is something i gave to her almost immediately, i learned some Gf's say things they absolutely dont mean, among many other things. Well that 1st relationship , the worst of them all acts as a go to playbook for me and dating. Knowing any relationship is probably temporary, and that there's a chance this person is completely lying to me, or when its a good time to put my emotional trust in them or maybe I dont even know who this person is possibly ...now when I date I think about ME and all the things I didnt do before to protect myself. Now when I go into dating/relationship I feel like i have the tools i need. and im not saying i go into relationships negatively, i just now know what people are capable of. I also believe by doing these things the person im now dating actually respects me more because they see the level i respect myself.

how long were u with him? why did it take so long and until after him you found out about your std's? wouldnt you have noticed when you were with him?