<human>: Condense the text into a few key points

My SO has had a lot of life experience. I'm (technically) his fifth girlfriend, where as I am his first. I've known him for a long time, and it's been pretty good, wouldn't really change a thing.

But there have been a few times in our relationship where I would remember his past. I want him to have new experiences. He's had 4 other girlfriends. Of course, I've been his first in a few areas (things like us going golfing for the first time, I was the first girl to get him flowers, etc.) But then I remember the other girls and think, "Oh... He's already done that with someone."

And to be honest, it feels like such an odd thing to think about. My brain tells me that I don't actually care about those things; it doesn't really make much sense TO care, because the first time isn't some magical thing and it'll always be our first time doing that activity *together*. I don't like being a jealous person. I don't like bringing it up either, because he feels like he is hurting me by talking to me about it. He doesn't know what to do. *I* don't know what to do. I can't help how I feel. It's helped that these thoughts have decreased over the time we've been together, to the point where it's been a year or so since I've had thoughts like that. Reason why I'm posting is because I just recently had an episode. My SO has been as supportive as he can be through it all. I really want to put this issue to rest, because even if we get through it just fine and I've been improving, I feel like I *do* need help.

So, how do I improve? Counseling is an option on the table. Not sure if it should be couple's counselling since the issue falls on me. If there are any books out there, or advice anyone has, I'd appreciate it.
<bot>: Jealous that my SO has a lot of first experiences with other girls. Got better but I just had an episode and realized that I'm not over it just yet. Any advice or steps in the right direction?