Is it normal to still have slight feelings

Ok so since my freshman year I really liked this guy who was a senior. We got to know each other and he'd always tell me how much he liked me and how much I meant to him, but he couldn't date me because of the 3 year age difference and he was scared of being made fun of so we stopped talking for quite a while. So I started talking to other guys but then the original boy started to become interested again. I eventually was asked out by this gay, we'll call him Devin and the original boy Steven. So Devin and I began a relationship and Steven got upset and would continually talk to me and I got so excited he was showing interest again but i was scared to end it with devin because i knew i would hurt him and steven and I weren't even doing anything just talking. Then a rumor went around Steven and I were talking about sex while dating Devin and he rushed to conclusions and broke up with me. That's when Steven and I started again. Everything seemed perfect and I loved him, but for some reason I could not bring myself to say yes when Steven asked me our, it just felt wrong to. Then when I snuck out to see him one night I got into trouble and couldn't see him again. Then that same night Devin called me crying and spilling out everything about how he felt for the 2 months that we were apart and all these sweet things. We ended up dating again a week later because he was being amazing while Steven was not. I also found out that during steven and my "amazing time" he was still talking to all these other girls. Devis it normal and I dated for about 2 months til I broke up with him because I felt still in love with Steven so it wasn't fair. Then I began talking with Steven and got together once and it felt completely wrong and I found out that the same night Steven was telling me he loved me, he asked my friend to come over to have sex so I didn't want to be with him and got back together with Devin. We've been dating for 8 amazing months and I'm madly in love with him. He's everything I could ever want. But whenever someone brings up Steven with another girl I get jealous, or being around him, or when he randomly texts me I miss you...it makes me wonder what it'd be like if I'd try how things work out with Steven but I know that I could never leave devin...help! My love and confusion