My husband said he wants a threesome

My husband wants another threesome but i am afraid the first one was a disaster he got soo carried away like a horny dog he said it was because he hadn't been with another woman in 7 years it was heart breaking seeing him with another woman it had me mess up for months even now and that was a year ago he asked me again about it i really want to give it to him to make him happy and so he won't go get it from another woman but i am not sure what to do i am not into women and seeing another woman fucking my husband again i really don't know what to do believe me