Messed up mind

Its about 2 guys. The first is my ex dated in high school had on and off relationship with him during his maturing period. Great guy vary respectful. Haven't spoken or seen him in a vary long while, however anytime I see him I get nervous and shaky and I can't find a way to make it mellow because I know I won't ever be able to make that feeling go away. The second is my current boyfriend I've been dating for 2 and a half years now. He reminds me of my dad cuz of his behavior and sometimes it's good and others not so much. We've had our couple arguments and still working thru life together. He still needs improving since he's about 2 years younger than I and I'm 22. Just yesterday my ex came over to talk and I listened and now he's got me confused cuz he basically said he still loves me and misses me. He's given me his number at least 3 times and I've gotten rid of it because I'm in a relationship and to text him on a daily would be like treason. I just don't know because I love him he was my first and all but I've dedicated time and myself to my current boyfriend we've been thru a lot and i don't feel right walking away from something I've started. Anyone have any thoughts I'm confused and I'd appreciate some input