Terra, i'm going through this with my boyfriend too. I think i'm more jealous than he is though, and even though my guy has only been with 4 girls I still get pretty mad sometimes... I'm just like "okayyyy, Brian... shush that mouth"
I look at it as....yeah you've done some stuff, you live & you learn. But the past is in the past and you're with him now and nobody else so he should be thankful for that and trust that you'd never do that again, especially now since you have a boyfriend, and I can totally tell you and Tommy will be together for a long time, You guys are just so cute and it's obvious you guys were meant to meet eachother.
I can understand why he's jealous because i'm jealous myself....but come on!!! I doubt you love girls...and I know you love tommy.
I love you terra, if you ever want someone to talk to send me a message!! I'll try to help anyway I can. <3