Sex Help!!!

Okay so I just spend the last week with my new boyfriend and when we first had sex, it hurt SO much, more than losing my virginity and I think it's because I was so tight and his dick was a lot bigger than what I'm used to. After a few days of us having sex it stopped hurting SIGNIFICANTLY and felt absolutely amazing! The problem is, we're in a long distance relationship and probably won't get to see each other but ever few months. And I'm just wondering if over that time, will I start to tighten up again or should I get a big dildo to use to masterbate so I won't tighten up again?? Please help! I'd really appreciate any and all advice here!!🙏🏽🙏🏽😘😘