Should I try again

I was seeing this guy for a little over a month. We broke up on New Year's eve. It was slowly becoming a sex only relationship even though I was trying to get to be more. He said he wasn't sure if he was ready yet for more but felt like he could have fallen in love with me eventually. So we break up. I decided to take a break from dating while I dealt with how I felt. I knew I liked him, I just didn't realize how much until we were breaking up. So this past weekend he texts me that he wants to try again. I told him things would have to be different. That he would have to be willing to try for it to be a real relationship. He said he would try if I was willing to try again. I want to yes to trying again but I want to be sure I'm doing it for the right reasons. Am I doing it because I care about him and want to be with him? Or am I doing it just so I can be with someone and not feel so alone? Or am I just trying to forget my ex (for anyone who has read my previous post, I'm referring to the ex that keeps messaging me even though he's with someone else)? Or am I doing this because I want a baby and I know being with him can be a means to getting what I want?  I don't want to use him or hurt him. I told him I need time to think and he's been letting me think. There was a little while were I thought I was pregnant (and it would have been his), but I tested negative this morning. I didn't tell him because I wanted to be sure and now that I know I'm not I don't see a point in telling him. I was on birth control but I thought it failed. I guess it was my birth control that was making me sick. I don't plan to go back for another depo shot. Before he texted me this weekend about getting back together, I was planning on doing IVF with a sperm donor. I just don't know what to do. I'm planning on texting him tonight to let him know I need more time. I want to try again but I don't want to get hurt and I don't want hurt or use him. I really do care about him and if we try again I think I can fall in love with him. I'm just so unsure.