<human>: First and foremost let me say I love my boyfriend (lets call him B). He is amazing and I am nothing but completely content in our relationship, he is supportive sweet and just an all around good guy. 

So let me get to my issue. Me and my friend (lets call him L) hang out about once a week with a group and occasionally go to shows together, would be better friends if he wasn't over the moon for another mutual friend of ours with whom he doesn't have a chance. He is leaving in like two weeks for god only knows how long so I am really trying to hang out with him. I love to cook for just about anyone that likes to eat and have offered to make him a home cooked meal before he leaves (where he is going he won't be getting many of those). 

The issue:
B has some issues with past infidelity, he would never tell me not to hang out with someone or anything because as we have discussed, I love him and am with him. I just am conscious about how my actions could bring up his insecurities. The issue arises in that I was open with B that L and I hooked up once, forever and a day ago before I even knew B. This one time thing never turned into anything more then us continuing to be friends, as I said he is over the moon for our mutual friend (and has been since before I met either of them) and will do anything to make sure she has the best opinion of him. Thus I want to hang out with my friend but want to be completely open with my boyfriend about it. 

Should I just not hang out with my friend before he leaves? Is there a way to talk to B about this and reassure him or am I having unrealistic expectations? Any suggestions would be lovely.

Condense the text into a few key points
<bot>: Want to hang out with a friend (who I hooked up with forever ago) before he leaves for an extended period, want to reassure boyfriend. Is it possible?